The individual gas fired appliances listed as not requiring a vent system will require vents if the total input rating to all listed appliances located in a single room (per cubic foot of available room space) exceeds _ ___ Btu.

The individual gas fired appliances listed as not requiring a vent system will require vents if the total input rating to all listed appliances located in a single room (per cubic foot of available room space) exceeds _ ___ Btu.