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Aside from other requirements, the Ontario Building Code waives the requirement for fire dampers if the duct serves air-conditioning or combined air-conditioning and heating units. Does anyone know why fire dampers are NOT waived if the duct serves heating only units? 3.1.8.8. Fire Dampers...

Not sure how 4.2.1 relates to the protection requirement on the wall. Why are they referring to 4.2.1?

Does anyone have an interpretation for NFPA 96 article 4.2.4.3? Does it mean the cooking appliance must have an 18 inch clearance to combustibles and 3 inch clearance to limited combustible and 0 inch to noncombustibles? Does it mean the clearance reduction system (ie sheet metal on mineral...

I commonly see the upper attachment for duct hangers to be screwed to the underside of the steel roof deck w/o a concrete overlay I do not see this detail in SMACNA. Is it permitted to hang ductwork from a steel corrugated roof deck or should the duct be supported from the open web steel...