0766 Draft hoods
0767 Vent connector slope
0768 Vent connector length
0769 Vent connector support
0770 Combustible clearances for vent connectors and B-vents
0771 Size of vent connector
0772 Chimney/vent connections
0773 Vent connector extends too far into chimney |  0774 Backdrafting
0775 House air flow
0776 Typical supply and return register locations
0777 Distribution components for forced air heating
0778 Factors affecting air supply
0779 Blowers - belt drive and direct drive
0780 Fan belts on furnace blowers |
