Document:

Exhibit 4(f)

                            ASSIGNMENT AND ACCEPTANCE

                             Dated November 29, 2005

     Reference is made to the Amended and Restated Credit  Agreement dated as of
October 14, 2005 (the "CREDIT  AGREEMENT")  among EMCOR Group,  Inc.,  the other
Borrowers,  the Lenders (as defined in the Credit Agreement) and Harris N.A., as
Agent for the Lenders (the "AGENT").  Terms defined in the Credit  Agreement are
used herein with the same meaning.

     Bank of Montreal  (the  "ASSIGNOR")  and Fifth Third Bank (the  "ASSIGNEE")
agree as follows:

     1.   The  Assignor  hereby  sells  and  assigns  to the  Assignee,  and the
Assignee hereby  purchases and assumes from the Assignor,  a 30% interest in and
to all of the Assignor's rights and obligations under the Credit Agreement as of
the Effective  Date (as defined  below),  including,  without  limitation,  such
percentage  interest in the Assignor's  Commitment as in effect on the Effective
Date and the  Revolving  Loans,  if any,  owing to the Assignor on the Effective
Date and the Assignor's Percentage of any outstanding L/C Obligation, if any.

     2.   The Assignor (i)  represents  and warrants  that as of the date hereof
(A) its  Commitment  is  $50,000,000,  (B) the aggregate  outstanding  principal
amount of Revolving  Loans made by it under the Credit  Agreement  that have not
been  repaid  is  $4,285,714.28  and a  description  of the  interest  rates and
currencies  for such Revolving  Loans is attached as Schedule 1 hereto,  and (C)
the aggregate  principal  amount of Assignor's  outstanding  L/C  Obligations is
$7,937,939.96 and a description of the expiry date, amount and account party for
such L/C Obligations is also attached as Schedule 1 hereto;  (ii) represents and
warrants  that it is the  legal  and  beneficial  owner  of the  interest  being
assigned by it hereunder and that such interest is free and clear of any adverse
claim,  lien,  or  encumbrance  of any kind;  (iii) makes no  representation  or
warranty  and  assumes  no  responsibility   with  respect  to  any  statements,
warranties or  representations  made in or in connection with the Loan Documents
or the execution, legality, validity, enforceability,  genuineness,  sufficiency
or value of the Loan  Documents or any other  instrument  or document  furnished
pursuant  thereto;  and (iv) makes no  representation or warranty and assumes no
responsibility  with respect to the  financial  condition of any Borrower or any
Guarantor or the  performance  or observance by any Borrower or any Guarantor of
any of their  respective  obligations  under the Credit  Agreement  or any other
instrument or document furnished pursuant thereto.

     3.   The Assignee (i)  confirms  that it has received  copies of the Credit
Agreement,  together  with  copies  of  the  most  recent  financial  statements
delivered to the Lenders pursuant to in Sections 7.5(a), (b) and (c) thereof and
such other  documents and  information as it has deemed  appropriate to make its
own credit  analysis and decision to enter into this  Assignment and Acceptance;
(ii) agrees that it will, independently and without reliance upon the Agent, the
Assignor or any other Lender and based on such  documents and  information as it
shall deem appropriate at the time, continue to make its own credit decisions in
taking or not taking  action  under the Credit  Agreement;  (iii)  appoints  and
authorizes the Agent to take such action as Agent

<PAGE>

on its  behalf and to  exercise  such  powers  under the Loan  Documents  as are
delegated to the Agent by the terms  thereof,  together  with such powers as are
reasonably  incidental  thereto;  (iv) agrees that it will perform in accordance
with  their  terms  all of the  obligations  which by the  terms  of the  Credit
Agreement  are required to be performed by it as a Lender;  and (v) specifies as
its lending  offices (and address for notices) the offices set forth beneath its
name on the signature pages hereof.

     4.   As consideration for the assignment and sale contemplated in Section 1
hereof,  the  Assignee  shall  pay to the  Assignor  on the  Effective  Date (as
hereinafter  defined)  in  federal  funds  an  amount  equal  to the  percentage
specified in Section One of the balance of Revolving  Loans  outstanding on such
date. It is understood that  commitment  and/or Letter of Credit fees accrued to
the date hereof with respect to the interest assigned hereby are for the account
of the Assignor and such fees  accruing  from and  including the date hereof are
for the account of the  Assignee.  Each of the Assignor and the Assignee  hereby
agrees that if it receives  any amount under the Credit  Agreement  which is for
the account of the other party hereto, it shall receive the same for the account
of such other  party to the extent of such other  party's  interest  therein and
shall promptly pay the same to such other party.

     5.   The effective date for this Assignment and Acceptance shall be October
14, 2005 (the "EFFECTIVE DATE").  Following the execution of this Assignment and
Acceptance,  it will be delivered to the Company for its  acceptance  and to the
Agent for acceptance and recording by the Agent.

     6.   Upon such acceptance and recording,  as of the Effective Date, (i) the
Assignee shall be a party to the Credit Agreement and, to the extent provided in
the  Assignment  and  Acceptance,  have the rights and  obligations  of a Lender
thereunder  and  (ii)  the  Assignor  shall,  to the  extent  provided  in  this
Assignment  and  Acceptance,  relinquish  its  rights and be  released  from its
obligations under the Credit Agreement.

     7.   Upon such acceptance and recording, from and after the Effective Date,
the Agent shall make all payments  under the Credit  Agreement in respect of the
interest  assigned  hereby  (including,  without  limitation,  all  payments  of
principal,  interest  and  commitment  and  letter of credit  fees with  respect
thereto) to the Assignee.  The Assignor and Assignee shall make all  appropriate
adjustments  in payments  under the Credit  Agreement  for periods  prior to the
Effective Date directly between themselves.

     8.   In accordance with Section 11.18 of the Credit Agreement, the Assignee
requests and directs that the Agent  prepare and cause the  Borrowers to execute
and deliver to the Assignee Revolving Credit Notes payable to the Assignee.

<PAGE>

     10.  This Assignment and Acceptance  shall be governed by, and construed in
accordance with, the laws of the State of Illinois.

                                        BANK OF MONTREAL

                                        By:
                                           -----------------------------------
                                            Name:
                                                 -----------------------------
                                            Title:
                                                  ----------------------------

                                        FIFTH THIRD BANK

                                        Lending Office(and
                                            address for notices):

                                          ------------------------------------

                                          ------------------------------------

                                        Attention:
                                                  ----------------------------

                                        By:
                                           -----------------------------------
                                              Name:
                                                   ---------------------------
                                              Title:
                                                    --------------------------

Accepted and consented this
29th day of November, 2005

EMCOR GROUP, INC.

By:
   -----------------------------------
    Name:
         -----------------------------
    Title:
          ----------------------------

Accepted and consented to by the Agent this
29th day of November, 2005

HARRIS N.A,. as Agent

By:
   -----------------------------------
    Name:
         -----------------------------
    Title:
          ----------------------------

<PAGE>

                                   SCHEDULE 1

                                LETTERS OF CREDIT

<TABLE>
<CAPTION>
   L/C NUMBER                 AMOUNT                        EXPIRY DATE           BENEFICIARY
   -----------------------    --------------------------    ------------------    ---------------------------------------------
<S>    <C>                    <C>                               <C>               <C>
   CAD 19663                  $422,868.74 (USD Equiv)           12/24/05          Canadian Imperial Bank of Commerce
   CAD 58202                  $217,725.00 (USD Equiv)            6/15/06          Ontario Power Generation
   S559178                    $12,591,000.00                     10/1/06          American Casualty Company of Reading, PA
   S561252                    $8,481,050.00                      9/15/07          Southeast Corridor Construction
   S574136                    $17,003,000.00                     10/1/06          Transportation Insurance Company
   USD 19624                  $863,110.00                        10/1/06          Ace American Insurance Company
   USD 19637                  $662,070.00                        9/30/06          Ace Property & Casualty Insurance Company
   USD 19638                  $2,202,000.00                      10/1/06          Transportation Insurance Company
   USD 19640                  $500,000.00                        7/31/06          Reliance Insurance Company, United
   USD 19644                  $2,853,000.00                      9/1/06           Continental Casualty Company
   USD 19646                  $876,000.00                        9/1/06           Continental Casualty Company
   USD 19647                  $1,270,000.00                      9/1/06           Continental Casualty Company
   USD 19649                  $194,037.00                        2/28/06          County of Los Angeles
   USD 19651                  $5,938,000.00                      9/30/06          American Casualty Company of Reading, PA
   USD 19654                  $92,283.00                         4/30/06          County of Los Angeles
   USD 62175                  $403,116.00                       12/22/05          County of Los Angeles
   USD 62176                  $104,345.00                       12/15/05          County of Los Angeles
   USD 19645                  $900,000.00                       12/31/05          The Travelers Casualty & Surety
   USD 19653                  $5,000.00                         12/31/07          City of Chicago
</TABLE>Exhibit 4(g)

                            ASSIGNMENT AND ACCEPTANCE

                             Dated November 29, 2005

     Reference is made to the Amended and Restated Credit  Agreement dated as of
October 14, 2005 (the "CREDIT  AGREEMENT")  among EMCOR Group,  Inc.,  the other
Borrowers,  the Lenders (as defined in the Credit Agreement) and Harris N.A., as
Agent for the Lenders (the "AGENT").  Terms defined in the Credit  Agreement are
used herein with the same meaning.

     Bank of Montreal  (the  "ASSIGNOR")  and The  Northern  Trust  Company (the
"ASSIGNEE") agree as follows:

     1.   The  Assignor  hereby  sells  and  assigns  to the  Assignee,  and the
Assignee hereby  purchases and assumes from the Assignor,  a 20% interest in and
to all of the Assignor's rights and obligations under the Credit Agreement as of
the Effective  Date (as defined  below),  including,  without  limitation,  such
percentage  interest in the Assignor's  Commitment as in effect on the Effective
Date and the  Revolving  Loans,  if any,  owing to the Assignor on the Effective
Date and the Assignor's Percentage of any outstanding L/C Obligation, if any.

     2.   The Assignor (i)  represents  and warrants  that as of the date hereof
(A) its  Commitment  is  $50,000,000,  (B) the aggregate  outstanding  principal
amount of Revolving  Loans made by it under the Credit  Agreement  that have not
been  repaid  is  $4,285,714.28  and a  description  of the  interest  rates and
currencies  for such Revolving  Loans is attached as Schedule 1 hereto,  and (C)
the aggregate  principal  amount of Assignor's  outstanding  L/C  Obligations is
$7,937,939.96 and a description of the expiry date, amount and account party for
such L/C Obligations is also attached as Schedule 1 hereto;  (ii) represents and
warrants  that it is the  legal  and  beneficial  owner  of the  interest  being
assigned by it hereunder and that such interest is free and clear of any adverse
claim,  lien,  or  encumbrance  of any kind;  (iii) makes no  representation  or
warranty  and  assumes  no  responsibility   with  respect  to  any  statements,
warranties or  representations  made in or in connection with the Loan Documents
or the execution, legality, validity, enforceability,  genuineness,  sufficiency
or value of the Loan  Documents or any other  instrument  or document  furnished
pursuant  thereto;  and (iv) makes no  representation or warranty and assumes no
responsibility  with respect to the  financial  condition of any Borrower or any
Guarantor or the  performance  or observance by any Borrower or any Guarantor of
any of their  respective  obligations  under the Credit  Agreement  or any other
instrument or document furnished pursuant thereto.

     3.   The Assignee (i)  confirms  that it has received  copies of the Credit
Agreement,  together  with  copies  of  the  most  recent  financial  statements
delivered to the Lenders pursuant to in Sections 7.5(a), (b) and (c) thereof and
such other  documents and  information as it has deemed  appropriate to make its
own credit  analysis and decision to enter into this  Assignment and Acceptance;
(ii) agrees that it will, independently and without reliance upon the Agent, the
Assignor or any other Lender and based on such  documents and  information as it
shall deem appropriate at the time, continue to make its own credit decisions in
taking or not taking  action  under the Credit  Agreement;  (iii)  appoints  and
authorizes the Agent to take such action as Agent

<PAGE>

on its  behalf and to  exercise  such  powers  under the Loan  Documents  as are
delegated to the Agent by the terms  thereof,  together  with such powers as are
reasonably  incidental  thereto;  (iv) agrees that it will perform in accordance
with  their  terms  all of the  obligations  which by the  terms  of the  Credit
Agreement  are required to be performed by it as a Lender;  and (v) specifies as
its lending  offices (and address for notices) the offices set forth beneath its
name on the signature pages hereof.

     4.   As consideration for the assignment and sale contemplated in Section 1
hereof,  the  Assignee  shall  pay to the  Assignor  on the  Effective  Date (as
hereinafter  defined)  in  federal  funds  an  amount  equal  to the  percentage
specified in Section One of the balance of Revolving  Loans  outstanding on such
date. It is understood that  commitment  and/or Letter of Credit fees accrued to
the date hereof with respect to the interest assigned hereby are for the account
of the Assignor and such fees  accruing  from and  including the date hereof are
for the account of the  Assignee.  Each of the Assignor and the Assignee  hereby
agrees that if it receives  any amount under the Credit  Agreement  which is for
the account of the other party hereto, it shall receive the same for the account
of such other  party to the extent of such other  party's  interest  therein and
shall promptly pay the same to such other party.

     5.   The effective date for this Assignment and Acceptance shall be October
14, 2005 (the "EFFECTIVE DATE").  Following the execution of this Assignment and
Acceptance,  it will be delivered to the Company for its  acceptance  and to the
Agent for acceptance and recording by the Agent.

     6.   Upon such acceptance and recording,  as of the Effective Date, (i) the
Assignee shall be a party to the Credit Agreement and, to the extent provided in
the  Assignment  and  Acceptance,  have the rights and  obligations  of a Lender
thereunder  and  (ii)  the  Assignor  shall,  to the  extent  provided  in  this
Assignment  and  Acceptance,  relinquish  its  rights and be  released  from its
obligations under the Credit Agreement.

     7.   Upon such acceptance and recording, from and after the Effective Date,
the Agent shall make all payments  under the Credit  Agreement in respect of the
interest  assigned  hereby  (including,  without  limitation,  all  payments  of
principal,  interest  and  commitment  and  letter of credit  fees with  respect
thereto) to the Assignee.  The Assignor and Assignee shall make all  appropriate
adjustments  in payments  under the Credit  Agreement  for periods  prior to the
Effective Date directly between themselves.

     8.   In accordance with Section 11.18 of the Credit Agreement, the Assignee
requests and directs that the Agent  prepare and cause the  Borrowers to execute
and deliver to the Assignee Revolving Credit Notes payable to the Assignee.

<PAGE>

     11.  This Assignment and Acceptance  shall be governed by, and construed in
accordance with, the laws of the State of Illinois.

                                        BANK OF MONTREAL

                                        By:
                                           -----------------------------------
                                            Name:
                                                 -----------------------------
                                            Title:
                                                  ----------------------------

                                        THE NORTHERN TRUST COMPANY

                                        Lending Office(and
                                            address for notices):

                                          ------------------------------------

                                          ------------------------------------

                                        Attention:
                                                  ----------------------------

                                        By:
                                           -----------------------------------
                                              Name:
                                                   ---------------------------
                                              Title:
                                                    --------------------------

Accepted and consented this
29th day of November, 2005

EMCOR GROUP, INC.

By:
   -----------------------------------
    Name:
         -----------------------------
    Title:
          ----------------------------

Accepted and consented to by the Agent this
29th day of November, 2005

HARRIS N.A,. as Agent

By:
   -----------------------------------
    Name:
         -----------------------------
    Title:
          ----------------------------

<PAGE>

                                   SCHEDULE 1

                                LETTERS OF CREDIT

<TABLE>
<CAPTION>
L/C NUMBER                 AMOUNT                         EXPIRY DATE           BENEFICIARY
-----------------------    ---------------------------    ------------------    --------------------------------------------
<S>                        <C>                                <C>               <C>
CAD 19663                  $422,868.74 (USD Equiv)            12/24/05          Canadian Imperial Bank of Commerce
CAD 58202                  $217,725.00 (USD Equiv)             6/15/06          Ontario Power Generation
S559178                    $12,591,000.00                      10/1/06          American Casualty Company of Reading, PA
S561252                    $8,481,050.00                       9/15/07          Southeast Corridor Construction
S574136                    $17,003,000.00                      10/1/06          Transportation Insurance Company
USD 19624                  $863,110.00                         10/1/06          Ace American Insurance Company
USD 19637                  $662,070.00                         9/30/06          Ace Property & Casualty Insurance Company
USD 19638                  $2,202,000.00                       10/1/06          Transportation Insurance Company
USD 19640                  $500,000.00                         7/31/06          Reliance Insurance Company, United
USD 19644                  $2,853,000.00                       9/1/06           Continental Casualty Company
USD 19646                  $876,000.00                         9/1/06           Continental Casualty Company
USD 19647                  $1,270,000.00                       9/1/06           Continental Casualty Company
USD 19649                  $194,037.00                         2/28/06          County of Los Angeles
USD 19651                  $5,938,000.00                       9/30/06          American Casualty Company of Reading, PA
USD 19654                  $92,283.00                          4/30/06          County of Los Angeles
USD 62175                  $403,116.00                        12/22/05          County of Los Angeles
USD 62176                  $104,345.00                        12/15/05          County of Los Angeles
USD 19645                  $900,000.00                        12/31/05          The Travelers Casualty & Surety
USD 19653                  $5,000.00                          12/31/07          City of Chicago
</TABLE>

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