Kitchen Exhaust Duct

3 vent the fan to the outside. The kitchen vent fan must exhaust directly to the outside not into an attic crawlspace or a space between floors. In commercial kitchens exhaust hoods are often used in combination with fire suppression devices so that fumes from a grease.

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Kitchen exhaust duct. The duct for your exhaust fan needs to be run to the outside of the house to remove the chance of a fire hazard. Fire dampers which are usually installed in ventilation ducts to prevent fire spread are not permitted within a kitchen exhaust duct system. Straight duct is better than flex duct fewer bends are better. Or grease laden exhaust ducts.

The fan s installation instructions should specify the diameter of the duct. Insurers are aware of these fire risks are you. Step 2 run the ducts. Use rigid duct with insulated duct sleeve for an oven exhaust fan.

Ducts exposed to the outside atmosphere or subject to a corrosive environment shall be protected against corrosion in an approved. Your vent hood will have places available for either attic or wall exhaust. Running a kitchen vent fan without makeup air can create negative pressure that pulls exhaust gases from water heaters or other gas burning appliances into the house an effect called backdrafting. The exhaust system doesn t get the air it needs and operates at a lower efficiency.

Connect the operation of the dishwasher exhaust fan to the dishwasher control panel. The dishwasher fan should be an alu minum unit. Commercial kitchen hood ventilation ducts and exhaust equipment shall comply with the requirements of this section. Even if it is vented.

Small diameter ducts could trap grease creating a fire hazard. Always read the small print. The exhaust duct should be liquid tight and pitch back toward the dishwasher. Exhaust ductwork should be stainless steel below the kitchen ceiling and either stainless steel or aluminum above the ceil ing.

The duct should be smooth and straight with as few bends as possible. Commercial kitchen grease ducts shall be designed for the type of cooking appliance and hood served. Grease ducts are regulated both in terms of their construction and maintenance forming part of the building s passive fire. We ll cover how to run an insulated duct sleeve.

A kitchen hood exhaust hood or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen it removes airborne grease combustion products fumes smoke heat and steam from the air by evacuation of the air and filtration. Exhaust hoods installed over broiler units should have at least 24 inches clearance above the cook top and the hood should extend the full width and depth of the cooktop. They do not work in kitchen exhaust because grease on the downstream side of the damper. A grease duct is a duct that is connected to the kitchen exhaust hood and is specifically designed to vent grease smoke and other harmful contaminants from commercial cooking equipment to the outside of a building.

Cover the hole that you are not using for exhaust and secure the hood to its final positioning to mark the location of the vent duct. Next project family handyman. Not into the attic. This article shows the best way to vent a hood and exhaust fan that s above the stove when you have an interior wall with cabinets above.