Specialty Gas Vent
Commercial Industrial Disposable Filter
Envirco IsoClean 400/800
Envirco IsoClean CM
Using tables from the National Fuel Gas Code or our Sizing & Application Guide, determine the diameter of venting required. The Sizing & Application Guide also offers tips on good design including multi-appliance system sizing and design.
Sizes 4" and 5" may be installed with 1' minimum clearance to combustibles.
Four-inch oval vent (when installed in 2x4 stud wall with recessed heater) requires clearances as determined by use of 4OBPWS hold-down plate, 4OCP ceiling plate spacers, and 4OFS firestop spacers.
Four and five inch oval vent (when installed in 2 x 4 stud wall, not using a recessed heater) requires clearance as determined by use of 4OFS or 5OFS firestop spacers at each ceiling level.
* Add length to complete Model Number.
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