Page 301 - 2018_IFC

FLAMMABLE FINISHES

ventilation system shall be designed, installed and feet (9144 mm) from combustible walls or openings
maintained so that the average air velocity into the into the building that are in the direction of the
spray booth through openings is not less than 100 feet exhaust discharge; 10 feet (3048 mm) above adjoin-
per minute (0.51 m/s). ing grade.
Exceptions: 2. Other product-conveying outlets: 10 feet (3048 mm)
from the lot line; 3 feet (914 mm) from exterior
1. For fixed or automated electrostatic spray
walls and roofs; 10 feet (3048 mm) from openings
application equipment, the average air veloc-
ity into the spray booth through all openings into the building; 10 feet (3048 mm) above adjoin-
shall be not less than 50 feet per minute (0.25 ing grade.
m/s). 2404.7.7 Fan motors and belts. Electric motors driving
exhaust fans shall not be placed inside booths or ducts.
2. Where methods are used to reduce cross drafts
that can draw vapors and overspray through Fan rotating elements shall be nonferrous or nonsparking
openings from the spray booth or spray room, or the casing shall consist of, or be lined with, such mate-
the average air velocity into the spray booth or rial. Belts shall not enter the duct or booth unless the belt
spray room shall be that necessary to capture and pulley within the duct are tightly enclosed.
and confine vapors and overspray to the spray 2404.7.8 Filters. Air intake filters that are part of a wall or
booth or spray room. ceiling assembly shall be listed as Class I or II in accor-
2404.7.4 Ventilation obstruction. Articles being sprayed dance with UL 900. Exhaust filters shall be required.
shall be positioned in a manner that does not obstruct col- 2404.7.8.1 Supports. Supports and holders for filters
lection of overspray. shall be constructed of noncombustible materials.
2404.7.5 Independent ducts. Each spray booth and spray 2404.7.8.2 Attachment. Overspray collection filters
room shall have an independent exhaust duct system dis- shall be readily removable and able to be accessed for
charging to the outside. cleaning or replacement.
Exceptions: 2404.7.8.3 Maintaining air velocity. Visible gauges,
1. Multiple spray booths having a combined frontal audible alarms or pressure-activated devices shall be
2
area of 18 square feet (1.67 m ) or less are installed to indicate or ensure that the required air
allowed to have a common exhaust where identi- velocity is maintained.
cal spray finishing material is used in each booth. 2404.7.8.4 Filter rolls. Spray booths equipped with a
If more than one fan serves one booth, fans shall filter roll that is automatically advanced when the air
be interconnected such that all fans will operate velocity is reduced to less than 100 feet per minute
simultaneously. (0.51 m/s) shall be arranged to shut down the spraying
2. Where treatment of exhaust is necessary for air operation if the filter roll fails to advance automati-
pollution control or for energy conservation, cally.
ducts shall be allowed to be manifolded if all of 2404.7.8.5 Filter disposal. Discarded filter pads shall
the following conditions are met: be immediately removed to a safe, detached location or
2.1. The sprayed materials used are compati- placed in a noncombustible container with a tight-fit-
ble and will not react or cause ignition of ting lid and disposed of properly.
the residue in the ducts. 2404.7.8.6 Spontaneous ignition. Spray booths using
2.2. Nitrocellulose-based finishing material dry filters shall not be used for spraying materials that
shall not be used. are highly susceptible to spontaneous heating and igni-
tion. Filters shall be changed prior to spraying materials
2.3. A filtering system shall be provided to that could react with other materials previously col-
reduce the amount of overspray carried lected. An example of a potentially reactive combina-
into the duct manifold.
tion includes lacquer when combined with varnishes,
2.4. Automatic sprinkler protection shall be stains or primers.
provided at the junction of each booth 2404.7.8.7 Waterwash spray booths. Waterwash
exhaust with the manifold, in addition to spray booths shall be of an approved design so as to
the protection required by this chapter. prevent excessive accumulation of deposits in ducts
2404.7.6 Termination point. The termination point for and residue at duct outlets. Such booths shall be
exhaust ducts discharging to the atmosphere shall be not arranged so that air and overspray are drawn through a
less than the following distances: continuously flowing water curtain before entering an
exhaust duct to the building exterior.
1. Ducts conveying explosive or flammable vapors,
fumes or dusts: 30 feet (9144 mm) from the lot line; 2404.8 Interlocks. Interlocks for spray application finishes
10 feet (3048 mm) from openings into the building; shall be in accordance with Sections 2404.8.1 through
6 feet (1829 mm) from exterior walls and roofs; 30 2404.8.2.

268 2018 INTERNATIONAL FIRE CODE ®
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