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Exhaust Duct Maintenance & Structural Fire Safety Compliance
A spray booth’s exhaust ductwork is the primary highway for moving volatile vapors and overspray particles out of the shop environment. Over time, paint solids escape the filter bank and bake onto the interior walls of the ductwork and the exhaust fan blades. This heavy accumulation chokes air velocity and creates a severe, highly combustible fire hazard if left unchecked.
Procedural Steps to Maintain Exhaust Ducts
Step 1: Pre-Inspection Safety Protocol
Complete Isolation: Always lock out and tag out the main electrical disconnect switch for the exhaust fan motor before opening any duct access doors.
Fall Protection: Use stable, industrial-grade ladders or scaffolding when servicing vertical duct stacks or roof-mounted components.
Step 2: The Clean-Out Door & Stack Inspection
The Inspection Interval: Inspect the interior of the exhaust ductwork, stack head, and fan assembly at least once a month for paint buildup.
Accessing the System: Utilize designated duct clean-out doors located along the stack run to visually check the thickness of the residue layer.
What to Look For: Pay close attention to elbows, transitions, and the areas directly preceding the automatic roof ventilator (stack head). These directional shifts are natural collection points for heavy overspray drop-out.
Step 3: Proper Mechanical Stripping Procedures
Non-Sparking Tools Only: When scraping dried paint, tar, or residue from the interior duct walls, use exclusively non-ferrous, non-sparking scrapers (such as brass, aluminum, or heavy-duty plastic). Standard steel scrapers can create friction sparks that can ignite flammable dust pockets inside the stack.
Protecting Moving Components: Carefully scrape the interior casing and any backdraft dampers inside the stack head assembly. Ensure the dampers swing completely free and do not bind due to paint buildup.
Debris Collection: Sweep and vacuum all loose paint flakes and scrapings out of the duct bottom. Do not allow debris to fall back down into the fan wheel housing or onto the booth cabin roof. Collect all waste immediately and store it in a code-compliant, tight-fitting, non-combustible waste container.
🛠️ Featured Shop Essentials
Keep your ventilation paths clear and fire-safe:
Heavy-Duty High-Capacity Exhaust Media (Stops overspray before it reaches your ductwork)
15G Poly-Backed Fiberglass Paint Arrestors are designed for spray booths that demand greater filtration beyond the capabilities of standard fiberglass.
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$268.25–$740.43Price range: $268.25 through $740.43
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PA Series 22G Fiberglass Filters are a heavy duty media, AFC’s most popular arrestors and most economical option for capturing and filtering overspray.
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$150.92–$1,188.45Price range: $150.92 through $1,188.45
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The PEY Series Polyester Paint Arrestor is a high efficiency, 2″ dry polyester media made for medium to heavy duty filtration applications where performance and the removal of a wide range of particles is the priority.
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$258.92–$463.63Price range: $258.92 through $463.63
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HEPA filtration is for use in the final stage of finishing systems where ultra fine particulate capture is required. Pre-filters are used to extend the life of the more expensive final stage HEPA.
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$999.00–$1,029.00Price range: $999.00 through $1,029.00
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Compare Binks, Andreae, Chemco and Compleat accordion style high efficiency filters to The Accordion, the only American made accordion overspray collector. 10+ boxes ship free!
$61.00–$69.00Price range: $61.00 through $69.00
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Compare to Binks, Andreae, Chemco and Compleat accordion style, single stage filters. The Accordion is the better baffle for overspray collection. 10+ boxes ship free!
$56.00–$65.00Price range: $56.00 through $65.00
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The King Series Premium Media fiber structure and tri-layer design provide an extremely efficient and long lasting media, creating an ideal painting environment with all paint types, including waterborne.
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$287.62–$1,512.28Price range: $287.62 through $1,512.28
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