Document:

Revolving Line of Credit Note

 Exhibit 10.43 
 REVOLVING LINE OF CREDIT NOTE 
  

			
	$15,000,000.00	  	 San Diego, California
 December 5, 2011

 FOR VALUE RECEIVED, the undersigned MAXWELL TECHNOLOGIES, INC. (“Borrower”) promises to pay to the order of
WELLS FARGO BANK, NATIONAL ASSOCIATION (“Bank”) at its office at 10421 Wateridge Court, Suite 150, San Diego, CA 92121, or at such other place as the holder hereof may designate, in lawful money of the United States of America and in
immediately available funds, the principal sum of Fifteen Million Dollars ($15,000,000.00), or so much thereof as may be advanced and be outstanding, with interest thereon, to be computed on each advance from the date of its disbursement as set
forth herein. 
 DEFINITIONS: 
 As used herein, the following terms shall have the meanings set forth after each, and any other term defined in this Note shall have the meaning set forth at the place defined: 

(a) “Business Day” means any day except a Saturday, Sunday or any other day on which commercial banks in California are
authorized or required by law to close. 
 (b) “Fixed Rate Term” means a period commencing on a Business Day and
continuing for a period of thirty (30) days, during which all or a portion of the outstanding principal balance of this Note bears interest determined in relation to LIBOR; provided however, that no Fixed Rate Term may be selected for a
principal amount less than One Million Dollars ($1,000,000); and provided further, that no Fixed Rate Term shall extend beyond the scheduled maturity date hereof. If any Fixed Rate Term would end on a day which is not a Business Day, then such Fixed
Rate Term shall be extended to the next succeeding Business Day 
 (c) “LIBOR” means the rate per annum (rounded
upward, if necessary, to the nearest whole 1/8 of 1%) and determined pursuant to the following formula: 
  

			
	LIBOR =	  	 Base LIBOR

		  	100% - LIBOR Reserve Percentage

 (i) “Base LIBOR” means the rate per annum for United States dollar deposits quoted by Bank for
the purpose of calculating effective rates of interest for loans making reference to LIBOR, as the Inter-Bank Market Offered Rate, with the understanding that such rate is quoted by Bank for the purpose of calculating effective rates of interest for
loans making reference thereto, on the first day of a Fixed Rate Term for delivery of funds on said date for a period of thirty (30) days and in an amount approximately equal to the principal amount to which such Fixed Rate Term applies.
Borrower understands and agrees that Bank may base its quotation of the Inter-Bank Market Offered Rate upon such offers or other market indicators of the Inter-Bank Market as Bank in its discretion deems appropriate including, but not limited to,
the rate offered for U.S. dollar deposits on the London Inter-Bank Market. 
 (ii) “LIBOR Reserve Percentage” means
the reserve percentage prescribed by the Board of Governors of the Federal Reserve System (or any successor) for “Eurocurrency Liabilities” (as defined in Regulation D of the Federal Reserve Board, as amended), adjusted by Bank for
expected changes in such reserve percentage during a one (1) month period. 

  
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 (d) “Prime Rate” means at any time the rate of interest most recently announced
within Bank at its principal office as its Prime Rate, with the understanding that the Prime Rate is one of Bank’s base rates and serves as the basis upon which effective rates of interest are calculated for those loans making reference
thereto, and is evidenced by the recording thereof after its announcement in such internal publication or publications as Bank may designate. 

INTEREST: 
 (a)
Interest. The outstanding principal balance of this Note shall bear interest (computed on the basis of a three hundred sixty (360) day year, actual days elapsed) either (i) at a floating rate per annum equal to the Prime Rate in
effect from time to time or (ii) at a fixed rate per annum determined by Bank to be two and one quarter of one percent (2.25%) above LIBOR in effect on the first day of the Fixed Rate Term. When interest is determined in relation to the
Prime Rate, each change in the interest rate shall become effective each Business Day that the Bank determines that the Prime Rate has changed. Bank is hereby authorized to note the date, principal amount and interest rate applicable thereto and any
payments made thereon on Bank’s books and records (either manually or by electronic entry) and/or on any schedule attached to this Note, which notations shall be prima facie evidence of the accuracy of the information noted. 

(b) Selection of Interest Rate Options. At any time any portion of this Note bears interest determined in relation to LIBOR for a
Fixed Rate Term, it may be continued by Borrower at the end of the Fixed Rate Term so that all or a portion thereof bears interest determined in relation to the Prime Rate or to LIBOR for a new Fixed Rate Term. At any time any portion of this Note
bears interest determined in relation to the Prime Rate, Borrower may at any time convert all or a portion thereof so that it bears interest determined in relation to LIBOR for a Fixed Rate Term. At such time as Borrower requests an advance
hereunder or wishes to select an interest rate determined in relation to the Prime Rate or a Fixed Rate Term for all or a portion of the outstanding principal balance hereof, and at the end of each Fixed Rate Term, Borrower shall give Bank notice
specifying: (i) the interest rate option selected by Borrower and (ii) the principal amount subject thereto. Any such notice may be given by telephone (or such other electronic method as Bank may permit) so long as, with respect to each
LIBOR selection for a Fixed Rate Term, (A) if requested by Bank, Borrower provides to Bank written confirmation thereof not later than three (3) Business Days after such notice is given, and (B) such notice is given to Bank
(i) prior to 10:00 a.m. Pacific time, on the first day of the Fixed Rate Term, or (ii) at a later time during any Business Day if Bank, at its sole option but without obligation to do so, accepts Borrower’s notice and quotes a fixed
rate to Borrower. If Borrower does not immediately accept a fixed rate when quoted by Bank, the quoted rate shall expire and any subsequent LIBOR request from Borrower shall be subject to a redetermination by Bank of the applicable fixed rate. If no
specific designation of interest is made at the time any advance is requested hereunder or at the end of any Fixed Rate Term, Borrower shall be deemed to have made a Prime Rate interest selection for such advance or the principal amount to which
such Fixed Rate Term applied. 
 (c) Taxes and Regulatory Costs. Borrower shall pay to Bank immediately upon demand, in
addition to any other amounts due or to become due hereunder, any and all (i) withholdings, interest equalization taxes, stamp taxes or other taxes (except income and franchise taxes) imposed by any domestic or foreign governmental authority
and related in any 

  
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manner to LIBOR, and (ii) future, supplemental, emergency or other changes in the LIBOR Reserve Percentage, assessment rates imposed by the Federal Deposit Insurance Corporation, or similar
requirements or costs imposed by any domestic or foreign governmental authority or resulting from compliance by Bank with any request or directive (whether or not having the force of law) from any central bank or other governmental authority and
related in any manner to LIBOR to the extent they are not included in the calculation of LIBOR. In determining which of the foregoing are attributable to any LIBOR option available to Borrower hereunder, any reasonable allocation made by Bank among
its operations shall be conclusive and binding upon Borrower. 
 (d) Payment of Interest. Interest accrued on this Note
shall be payable on the last day of each month, commencing December 31, 2011, in the case of loans accruing interest at Prime Rate, and on the last day of each Fixed Rate Term for loans accruing interest for a Fixed Rate Term. 

(e) Default Interest. From and after the maturity date of this Note, or such earlier date as all principal owing hereunder becomes
due and payable by acceleration or otherwise, or at Bank’s option upon the occurrence, and during the continuance of an Event of Default, the outstanding principal balance of this Note shall bear interest at an increased rate per annum
(computed on the basis of a three hundred sixty (360) day year, actual days elapsed) equal to five percent (5%) above the rate of interest from time to time applicable to this Note. 
 BORROWING AND REPAYMENT: 
 (a) Borrowing and Repayment. Borrower may from
time to time during the term of this Note borrow, partially or wholly repay its outstanding borrowings, and reborrow, subject to all of the limitations, terms and conditions of this Note, the Credit Agreement and any document executed in connection
with or governing this Note; provided however, that the total outstanding borrowings under this Note shall not at any time exceed the principal amount stated above. The unpaid principal balance of this obligation at any time shall be the total
amounts advanced hereunder by the holder hereof less the amount of principal payments made hereon by or for Borrower, which balance may be endorsed hereon from time to time by the holder. The outstanding principal balance of this Note shall be due
and payable in full on December 5, 2013 or such earlier date as all principal owing hereunder becomes due and payable by acceleration or otherwise. 
 (b) Advances. Advances hereunder, to the total amount of the principal sum stated above, may be made by the holder at the oral or written request of (i) David Schramm or Kevin Royal, or their
designees, any one acting alone, who are authorized to request advances and direct the disposition of any advances until written notice of the revocation of such authority is received by the holder at the office designated above, or (ii) any
person, with respect to advances deposited to the credit of any deposit account of Borrower, which advances, when so deposited, shall be conclusively presumed to have been made to or for the benefit of Borrower regardless of the fact that persons
other than those authorized to request advances may have authority to draw against such account. The holder shall have no obligation to determine whether any person requesting an advance is or has been authorized by Borrower. 

(c) Application of Payments. Each payment made on this Note shall be credited first, to any interest then due and second, to the
outstanding principal balance hereof. All payments credited to principal shall be applied first, to the outstanding principal balance of this Note which bears interest determined in relation to the Prime Rate, if any, and second, to the outstanding
principal balance of this Note which bears interest determined in relation to LIBOR. 

  
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 PREPAYMENT: 
 (a) Prime Rate. Borrower may prepay principal on any portion of this Note which bears interest determined in relation to the Prime Rate at any time, in any amount and without penalty. 

(b) LIBOR. Borrower may prepay principal on any portion of this Note which bears interest determined in relation to LIBOR for a
fixed rate at any time and in the minimum amount of One Million Dollars ($1,000,000); provided however, that if the outstanding principal balance of this Note is less than said amount, the minimum prepayment amount shall be the entire
outstanding principal balance thereof. In consideration of Bank providing this prepayment option to Borrower, or if any such portion of this Note shall become due and payable at any time prior to the last day of the Fixed Rate Term by acceleration
or otherwise, Borrower shall pay to Bank immediately upon demand a fee, calculated as follows for each such Fixed Rate Term: 
  

	 	(i)	Determine the amount of interest which would have accrued on the amount prepaid at the interest rate applicable to such amount had it remained outstanding until
the last day of the Fixed Rate Term. 

  

	 	(ii)	Subtract from the amount determined in (i) above the amount of interest which would have accrued for the same month on the amount prepaid for the remaining
term of such Fixed Rate Term at LIBOR in effect on the date of prepayment for new loans made for such term and in a principal amount equal to the amount prepaid. 

 

	 	(iii)	If the result obtained in (ii) for any Fixed Rate Term is greater than zero, discount that difference by LIBOR used in (ii) above. 

Borrower acknowledges that prepayment of such amount may result in Bank incurring additional costs, expenses and/or liabilities, and that it is difficult
to ascertain the full extent of such costs, expenses and/or liabilities. Borrower, therefore, agrees to pay the above-described prepayment fee and agrees that said amount represents a reasonable estimate of the prepayment costs, expenses and/or
liabilities of Bank. If Borrower fails to pay any prepayment fee when due, the amount of such prepayment fee shall thereafter bear interest until paid at a rate per annum seven and three-quarters of one percent (7.75%) above the Prime Rate in
effect from time to time (computed on the basis of a three hundred sixty (360) day year, actual days elapsed). 
 EVENTS OF DEFAULT:

 This Note is made pursuant to and is subject to the terms and conditions of that certain Credit Agreement between Borrower
and Bank dated as of the date hereof, as amended, restated, modified or supplemented from time to time (the “Credit Agreement”). Any default in the payment or performance of any obligation under this Note, or any defined event of default
under the Credit Agreement, shall constitute an “Event of Default” under this Note. 

  
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 MISCELLANEOUS: 
 (a) Remedies. Upon the occurrence and during the continuance of any Event of Default, the holder of this Note, at the holder’s option, may declare all sums of principal and interest
outstanding hereunder to be immediately due and payable without presentment, demand, notice of nonperformance, notice of protest, protest or notice of dishonor, all of which are expressly waived by Borrower, and the obligation, if any, of the holder
to extend any further credit hereunder shall immediately cease and terminate. Borrower shall pay to the holder immediately upon demand the full amount of all payments, advances, charges, costs and expenses, including reasonable attorneys’ fees
(to include outside counsel fees and all allocated costs of the holder’s in-house counsel), expended or incurred by the holder in connection with the enforcement of the holder’s rights and/or the collection of any amounts which become due
to the holder under this Note, and the prosecution or defense of any action in any way related to this Note, including without limitation, any action for declaratory relief, whether incurred at the trial or appellate level, in an arbitration
proceeding or otherwise, and including any of the foregoing incurred in connection with any bankruptcy proceeding (including without limitation, any adversary proceeding, contested matter or motion brought by Bank or any other person) relating to
Borrower or any other person or entity. 
 (b) Obligations Joint and Several. Should more than one person or entity sign
this Note as a Borrower, the obligations of each such Borrower shall be joint and several. 
 (c) Governing Law. This
Note shall be governed by and construed in accordance with the laws of the State of California. 

[Balance of Page Intentionally Left Blank] 

  
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 IN WITNESS WHEREOF, the undersigned has executed this Note as of the date first written
above. 
  

			
	MAXWELL TECHNOLOGIES, INC.
		
	By:	 	 /s/ Kevin Royal

	Name:	 	Kevin Royal
	Title:	 	CFO

 [Signature Page to Revolving Line of Credit Note]Third Supplemental Indenture

 Exhibit 4.5 
 THIRD SUPPLEMENTAL INDENTURE 
 This THIRD SUPPLEMENTAL INDENTURE, dated as of
October 27, 2011 (this “Third Supplemental Indenture”), among Service Experts Heating & Air Conditioning LLC (the “Guarantor”), Lennox International Inc., a Delaware corporation (the
“Company”), and each other then existing Guarantor under the Indenture referred to below (the “Existing Guarantors”), and U.S. Bank National Association, as Trustee under the Indenture referred to below. 

RECITALS 

WHEREAS, the Company, the Existing Guarantors and the Trustee have heretofore become parties to an Indenture, dated as of May 3,
2010 (the “Base Indenture” and, as supplemented by the First Supplemental Indenture (the “First Supplemental Indenture”), dated as of May 6, 2010, and the Second Supplemental Indenture (the “Second
Supplemental Indenture”), dated as of March 28, 2010, the “Indenture”), providing for the issuance of 4.900% Notes due 2017 of the Company (the “Notes”); 

WHEREAS, Section 8.06 of the First Supplemental Indenture provides that the Company is required to cause the Guarantor to execute
and deliver to the Trustee a supplemental indenture evidencing its guarantee of the punctual payment when due of all monetary obligations of the Company under the Indenture and the Notes on the terms and conditions set forth herein and in
Article 8 of the First Supplemental Indenture; 
 WHEREAS, the Guarantor desires to enter into such supplemental indenture for good and
valuable 
 consideration, including substantial economic benefit in that the financial performance and condition of such Guarantor is dependent
on the financial performance and condition of the Company, the obligations hereunder of which such Guarantor has guaranteed; and 
 WHEREAS,
pursuant to Section 8.01 of the Base Indenture, the parties hereto are authorized to execute and deliver this Third Supplemental Indenture to amend the Indenture, without the consent of any Holder; 

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby
acknowledged, the Guarantor, the Company, the Existing Guarantors and the Trustee mutually covenant and agree for the benefit of the Holders of the Notes as follows: 
 1. Defined Terms. As used in this Third Supplemental Indenture, terms defined in the Indenture or in the preamble or recital hereto are used herein as therein defined. The words “herein,”
“hereof” and “hereby” and other words of similar import used in this Third Supplemental Indenture refer to this Third Supplemental Indenture as a whole and not to any particular section hereof. 

2. Agreement to Guarantee. The Guarantor, as a primary obligor and not merely as surety, hereby irrevocably and fully and
unconditionally guarantees to each Holder and to the Trustee and its successor and assigns (the “Guarantee”), on a senior unsecured basis and equal in right of payment to all existing and future senior indebtedness of such
Guarantor, the punctual payment when due of all monetary obligations of the Company under the Indenture and the Notes, whether for principal of or interest on the Notes, on the terms and subject to the conditions set forth in Article 8 of the
First Supplemental Indenture and agrees to be bound by (and shall be entitled to the benefits of) all other applicable provisions of the Indenture as a Guarantor. 
 3. Termination, Release and Discharge. The Guarantor’s Guarantee shall terminate and be of no further force or effect, and the Guarantor shall be released and discharged from all obligations in
respect of such Guarantee, as and when provided in Section 8.03 of the First Supplemental Indenture. 
 4. Parties.
Nothing in this Third Supplemental Indenture is intended or shall be construed to give any Person, other than the Holders and the Trustee, any legal or equitable right, remedy or claim under or in respect of the Guarantor’s Guarantee or any
provision contained herein or in Article 8 of the First Supplemental Indenture. 

 5. Governing Law. This Third Supplemental Indenture and the Notes shall be deemed to be
a contract under the laws of the State of New York, and for all purposes shall be construed in accordance with the laws of such State, except as may otherwise be required by mandatory provisions of law. 

6. Ratification of Indenture; Supplemental Indentures Part of Indenture. The Indenture, as supplemented by this Third Supplemental
Indenture, is in all respects ratified and confirmed, and this Third Supplemental Indenture shall be deemed part of the Indenture in the manner and to the extent herein and therein provided. The recitals contained herein shall be taken as the
statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. 
 7. Counterparts.
This Third Supplemental Indenture may be executed in any number of counterparts, each of which shall be an original; but such counterparts shall together constitute but one and the same instrument. 

8. Headings. The section headings herein are for convenience only and shall not affect the construction hereof. 

IN WITNESS WHEREOF, the parties hereto have caused this Third Supplemental Indenture to be duly executed as of the date first above
written. 
  

					
	 LENNOX INDUSTRIES INC.
 ALLIED AIR ENTERPRISES INC.
 SERVICE EXPERTS LLC

LENNOX GLOBAL LTD.
 HEATCRAFT INC.

HEATCRAFT REFRIGERATION PRODUCTS LLC
 ADVANCED DISTRIBUTOR PRODUCTS LLC
 SERVICE EXPERTS HEATING & AIR CONDITIONING
LLC

		
	By:	 	              /s/ Rick Pelini
		 	Name:	 	Rick Pelini
		 	Title:	 	Vice President and Treasurer
	
	LENNOX INTERNATIONAL INC.
		
	By:	 	              /s/ Rick Pelini
		 	Name:	 	Rick Pelini
		 	Title:	 	Vice President and Treasurer

  

					
	U.S. BANK NATIONAL ASSOCIATION, as Trustee
		
	By:	 	              /s/ Israel Lugo
		 	Name:	 	Israel Lugo
		 	Title:	 	Vice President

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