FloAire Non-Welded Grease Duct Systems - Manual (Page 4)

4
LISTINGS
This grease duct is ETL listed to standard UL-1978 when installed in accordance with these installation
instructions and National Fire Protection Association Standard “NFPA 96, Standard for Ventilation Control
and Fire Protection of Commercial Cooking Operations”.
APPLICATION
The listed grease duct is suitable for use in commercial cooking installations for the removal of smoke
and grease laden vapors. The grease duct system includes all components for a complete exhaust
system from the hood to the exhaust fan inlet.
Grease duct installations require provisions for cleaning the interior of the duct. NFPA 96 cleanout
requirements are as follows:
1. A cleanout must be provided at each change of direction except where the entire length of duct
can be inspected and cleaned from either the hood or the discharge end.
2. On horizontal duct runs, at least one (1) 20” diameter opening must be provided. Where the
opening is smaller than 20” diameter, openings large enough to permit cleaning must be provided
at intervals of no more than 12’.
3. Openings must be at the side or the top, whichever is more accessible. When the opening is on
the side of the duct, the lower edge of the opening must be at least 1 ½” above the bottom of the
duct. For the listed grease duct, this is accomplished by the use of the grease manifold tee and
cleanout cap.
4. On vertical duct runs where personnel entry is possible, access must be from the top of the riser.
Where entry is not possible, access must be provided at each floor.
NOTE: ACCESS REQUIREMENTS ARE SUBJECT TO CHANGE IN ACCORDANCE WITH LOCAL
CODE. LOCAL AUTHORITIES SHOULD BE CONSULTED FOR EXACT REQUIRMENTS. GREASE
DUCT MAY BE CONNECTED ONLY TO HOODS IN A SINGLE FIRE ZONE ON ONE FLOOR. DO
NOT CONNECT GREASE DUCTS TO ANY OTHER PART OF THE BUILDING VENTILATION OR
EXHAUST SYSTEM.
When grease duct is installed in accordance with these installation instructions and the joints are sealed
properly with the recommended sealant, the system will contain a grease fire within the duct. A grease
fire can burn at extremely high temperatures. This system should be dismantled and inspected after any
exposure to a grease fire. Any section that is distorted or discolored should be replaced. All joints in the
system should be examined. Because the sealant expands to assure a positive seal in the case of a fire,
any sealant that has been exposed to high temperature must be replaced. This will ensure that the
system maintains its integrity against fire conditions in the future. The manufacturer of this grease duct
can not be responsible for grease duct systems that are not properly maintained or have been subjected
to one or more grease fires.
Grease duct systems size and capacity information may be obtained from the “ASHRAE Handbook –
Fundamentals” or from the “Air Pollution Engineering Manual” of the “US Environmental Protection
Agency”. Refer to the grease duct systems catalog for descriptions and dimensional data of parts.