Standard Kitchen Duct On Roof

The lack of kitchen exhaust grease duct cleaning resulted the exhaust fan s inevitable failure.

Standard kitchen duct on roof.

The ductwork connects the ventilation hood all the way up to the exhaust fan on the exterior of the building most often on the roof. 7 3 1 openings shall be provided at the sides or at the top of the duct whichever is more accessible and at a change of direction 7 4 1 1 on horizontal ducts at least one 508 mm x 508 mm 20 in. Screw the ductwork together with 1 4 in. Sheet metal screws and seal the seams with aluminum faced duct tape not regular cloth backed duct tape.

View the kitchen exhaust duct sizing chart below to determine your ductwork diameter based on range hood cfm. For the best airflow use smooth galvanized metal ducting rather than flexible or corrugated ducting. Minimum duct size of 4 recommended duct size of 6 401 600 cfm. Seal joints with duct joint mastic tape.

The more powerful the hood the larger the duct. Members follow the highest cleaning and inspection standards in the industry. For instance a typical 400 cfm unit requires a 6 inch duct while a 1 200 cfm model needs a 10 to 12 inch duct. Cut the hole for the duct attach it then install the roof cap.

If you live in an area where frost occurs add an insulated duct sleeve to the portion of pipe in the attic. The duct should exhaust air to the outside of the building through the roof or through an exterior wall and not into the attic or crawl space. Finally install the hood. The duct wall shall be constructed of 036 and 047 thick stainless steel and be available in diameters 8 through 36.

Ikeca members are committed to a thorough cleaning of the entire exhaust system from the hood in the kitchen to the fan on the roof. The installation requires the curb to be securely fastened to the vertical portion of the fan base assembly and it is recommended to use a minimum of at least 8 anchor bolts or other fasteners. The fan was replaced and proper cleaning of the entire system was carried out but the loss of income due to his restaurant shutdown cost them over 30 000 which was not covered by. The layout of the ductwork depends on the building design.

Action duct is certified by the international kitchen exhaust cleaning association ikeca. Ductwork must be located at a minimum of 18 from any roof surface per nfpa 96 7 8 2 1 and the discharge from the upblast fan must be a minimum of 40 from any roof surface. The outlet needs to be at least 10 feet from any window or other air inlet and it must be covered with a louver screen or grille. Minimum duct size of 6 recommended duct size of 8.