**Surface Coating of** Number range CHAPTER**Wood Building Products
NESHAP (subpart QQQQ)**

**Applicability Statement**

[Affected Source]{.underline}: An *affected source* is the collection of
items used for surface coating of wood building products, including but
not limited to: storage containers, mixing vessels, coating application
equipment, cleaning equipment, conveying equipment and containers, and
coating curing/drying equipment \[\'63.4682(b)\].

[Regulated Entities]{.underline}: The source category, which is divided
into the five subcategories listed in Table 1, includes sources that
apply coatings to wood building products. In general, sources that coat
wood building products are covered under the Standard Industrial
Classification (SIC) and North American Industrial Classification System
(NAICS) codes listed in Table 1. However, sources classified under other
SIC or NAICS codes may be subject to the final standards. Not all
sources classified under the SIC and NAICS codes in Table 1 will be
subject to the final standards because some of the classifications cover
products outside the scope of the NESHAP for wood building products.
This table is not intended to be exhaustive, but rather provides
guidance regarding subcategories and entities likely to be regulated by
the Surface Coating of Wood Building Products NESHAP \[68 FR 31746\].

**Table 1. Subcategories and Entities Potentially Regulated by the Wood
Building Products NESHAP \[\'63.4681(a)\]**

+-----------------+--------+------------+-----------------------------+
| **Subcategory** | *      | **NAICS**  | **Examples of regulated     |
|                 | *SIC** |            | entities include those      |
|                 |        |            | sources that apply a        |
|                 |        |            | surface coating to \...**   |
+-----------------+--------+------------+-----------------------------+
| Doors, Windows  | 2431,  | 321911,    | doors, finished doorskins,  |
| and             | 2      | 321918,    | finished exterior siding,   |
| Miscellaneous   | 499^a^ | 321999^a^  | windows, door and window    |
|                 |        |            | components such as          |
|                 |        |            | millwork, moulding, or      |
|                 |        |            | trim, and other             |
|                 |        |            | miscellaneous wood building |
|                 |        |            | products (including, but    |
|                 |        |            | not limited to, moulding,   |
|                 |        |            | trim, shingles, and         |
|                 |        |            | shutters).                  |
+-----------------+--------+------------+-----------------------------+
| Flooring        | 2426,  | 321918,    | solid wood flooring,        |
|                 | 2421,  | 321999^a^  | engineered wood flooring    |
|                 | 2      |            | and wood laminated          |
|                 | 499^a^ |            | flooring.                   |
+-----------------+--------+------------+-----------------------------+
| Interior Wall   | 2435,  | 321211,    | interior wall paneling and  |
| Paneling and    | 2      | 321999^a^  | tileboard.                  |
| Tileboard       | 499^a^ |            |                             |
+-----------------+--------+------------+-----------------------------+
| Other Interior  | 2435,  | 321211,    | panels that are sold for    |
| Panels          | 2436,  | 321212,    | uses other than interior    |
|                 | 2493,  |            | wall paneling, such as      |
|                 | 2      | 321219,    | coated particleboard,       |
|                 | 499^a^ | 321999^a^  | hardboard, and perforated   |
|                 |        |            | panels.                     |
+-----------------+--------+------------+-----------------------------+
| Exterior Siding | 2435,  | 321211,    | panel siding, trimboard,    |
| and Primed      | 2493,  | 321219,    | lap siding, trim associated |
| Doorskins^b^    | 2      | 321999^a^  | with siding, and primed     |
|                 | 499^a^ |            | doorskins.                  |
+-----------------+--------+------------+-----------------------------+

^a^ The subcategory of the SIC code and NAICS code depends on the final
end use of the product.

^b^ A doorskin coated with more than primer is included in the doors,
windows and miscellaneous subcategory.

**Surface Coating of Wood Building Products NESHAP - subpart QQQQ**

**Applicability Statement (continued)**

Your wood building products surface coating operations are
[NOT]{.underline} subject to subpart QQQQ if \[\'63.4681(b) and (c)\]:

1\) your affected source is not located at a major source of HAP
emissions;

2\) your affected source uses less than 4,170 liters (1,100 gallons) of
total coatings per

year;

> 3\) your surface coating operations are covered by the Plywood and
> Composite Wood Products NESHAP (subpart DDDD) upon promulgation \[edge
> seals, anti-skid coatings, primers applied to waferboard or oriented
> strand board (OSB), logos, trademarks, grade stamps, nail lines,
> synthetic patches, wood patches, wood putty, concrete forming oil and
> other drying or tempering oils, veneer composing, shelving edge
> fillers and surface coating that occurs during the manufacture of
> fiberboard\];
>
> 4\) your surface coating operations are covered by the Wood Furniture
> Manufacturing Operations NESHAP (subpart JJ) \[surface coating of wood
> furniture including: finishing, gluing, cleaning, and washoff
> operations associated with the production of wood furniture or wood
> furniture components and surface coating of millwork and trim
> associated with cabinet manufacturing\];
>
> 5\) your surface coating operations occur during the manufacture of
> prefabricated homes or mobile/modular homes;
>
> 6\) your surface coating operations occur at research or laboratory
> facilities; janitorial, building, and facility construction or
> maintenance operations; hobby shops that are operated for personal
> rather than for commercial purposes; non-commercial coating operations
> or coating applications using handheld nonrefillable aerosol
> containers; or
>
> 7\) your surface coating operations involve wood treatment or fire
> retardant operations located at wood building products sources that
> involve impregnating the wood product with the wood treatment
> chemicals or fire retardant by using a retort or other pressure
> vessel.

In addition, if your affected source uses at least 95 percent of its
total annual coating usage for surface coating operations that are
subject to the requirements of a NESHAP other than QQQQ, you may
demonstrate compliance with all the requirements, including all
applicable emission limits, for that subpart \[\'63.4681(d)\].