Sizing Vents And Chimneys Flashcards
Carbon dioxide spilled in the area of appliances will enter the combustion zone and create what
Carbon monoxide
What category are Appliances having draft hoods
Category 1
Atmospheric pressure inside buildings have category one appliances installed must not be allowed to drop more than
5 pascal or .02” water column
Minimum dimension of vent or chimney that is not round ?
and the minimum area of the vent shall be equal to that of what size
2”
3”
A vent connecter that serves a single appliance with multiple draft hoods or flu gas outlets will be sized how
ROT/ the vent connecter will have an area equal to the combined area of all appliance outlets
What column in the tables must be used to size a vent or chimney installed in an airtight building?
DP Column
Total vent height measured from the highest connected draft hood outlet or flu collar to the terminus not including rain cap to be able to reduce
At least 10’
If the appliance outlet size is 12 inch or smaller how much can you reduce ?
One table size only
If an appliance outlet size is large than the 12 inch how much can It reduce?
Two tables sizes only, engineers decisions usually at this size
Can Appliances with draft hood, smaller than 5 inch be reduced
No
For each 90° elbow beyond to the capacity of the venting sizing table will be reduced by what for draft appliances and fan assisted appliances
10% for draft hood
15% fan assisted
What length should the common vent connecter manifold not exceed per inch of diameter?
1.5’ per inch of diameter
Using rule of the method to determine the size of event prevent connecter for tour more appliances what information is used?
The size of the draft hood or flu collar outlet
Rule of thumb vent sizing for more than one APPLIANCE
States that the area of the vent will be equal to the area of the largest draft hood or flu collar +50% of the sum of the outlet areas of the additional appliances
How much do the tables reduce if the common vent is offset?
20%
