NOTE: PROPANE GAS OVENS
If it was not specified at purchase that your installation would be serviced by propane gas, then some modifications to your oven will be necessary. Call Col-Met Spray Booths, Inc. for instructions. If propane gas service was specified at purchase then no special provisions are required. You should follow the instructions above.
4.3 Exhaust Stack Installation
Any oven that is fueled by gas and any oven that is used to process a product that contains flammable volatiles or combustible material must include a powered exhaust fan. Exhaust stack is not normally provided with the oven. You must contact a local mechanical contractor or supplier for the appropriate ductwork.
4.3.1 Exhaust Stack Type
The type of stack required varies with exhaust temperature and the mechanical specifications of the building in which it is installed. Consult your local building and equipment authority for the relevant building code. In order to meet NFPA Standard 211 for Chimneys, Vents and Solid Fuel Burning Appliances a positive pressure stack rated for the applicable temperature is required.
4.3.2 Stack Termination (NFPA 211 – Section 4)
A metal chimney for an oven operating up to 500 F should extend at least three feet above the highest point where it passes through the roof and at least two feet above any portion of the building within ten feet laterally. For those ovens operating at temperatures greater than 500 F but less than 900 F, the chimney should extend at least ten feet above the highest point where it passes through the roof and at least ten feet above any portion of the building within 25 feet laterally.
4.3.3 Stack Clearances (NFPA 211 – Section 4)
A metal chimney should have a clearance of not less than 24” from any wooden construction or combustible material. A metal chimney shall have a clearance not less then 2” from any non -combustible structure. A metal chimney erected on the outside of a building shall not be installed any closer than 24” to any door, window or walkway. Consult NFPA 211, Section 4 for details on installation of a chimney through any story of a building or a combustible roof.
4.3.4 General Requirements
The oven’s rated CFM was calculated using 20 -foot tall, straight vertical exhaust stacks with no bends or turns. Any bends or turns in the exhaust stack may restrict the exhaust, causing a reduction in the maximum gallons of solvent that the oven can safely handle. If it is not practical to run the exhaust in this manner, a pressure drop analysis can be performed on your exhaust ducting by the engineering staff of Col-Met Spray Booths, Inc.
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