Wet-formed Fiberglass Mat Production
Air Toxics Notebook
Wet-formed Fiberglass Mat Production
eCFR Subpart HHHH 
[ecfr.gov]
You must comply with this subpart if you meet the following criteria:
1. You own or operate a drying and curing oven at a wet-formed fiberglass mat production facility and
2. Your drying and curing oven or the facility at which your drying and curing oven is located is a major source of hazardous air pollutants (HAP).
Applies to major sources of HAP that operate a drying or curing oven at a wet-formed fiberglass mat production facility. Wet-formed fiberglass is a substrate for asphalt roofing products.
No
02/28/2019 - Final Rule
04/06/2018 - Proposed Rule
04/11/2002 - Final Rule
As of September 28, 2022: Title 129, Chapter 13, Section 002.61
Previously: Chapter 28, Section 001.55.
Sources are also responsible for ensuring they are in compliance with current federal requirements found for this subpart in the CFR.
NSPS - 40 CFR Part 60
Subpart HHH - Synthetic Fiber Production
Subpart PPP - Wool Fiberglass Insulation
NESHAP - 40 CFR Part 63
Subpart DDD - Mineral Wool Production
Subpart NNN - Wool Fiberglass Mfg.
[ecfr.gov]EPA's Subpart HHHH Website 
[epa.gov] - contains federal register notices and implementation tools