Duct Design Type
Press the duct design row to select a value for the ductwork design. The valid design types are
- 7A-Radial or Spider SA and RA in Attic
- 7B-Radial or Spider SA in Attic and RA Thru Closet Door
- 7C-T and B SA in Attic, RA Riser in Floor to Ceiling Chase, Center Supply outlets
- 7D-T and B SA, RA in Closed Crawlspace or Unconditioned Basement
- 7E-T and B SA in Attic, RA Riser in Floor to Ceiling Chase, Perimeter Supply Outlets
Press the leakage type row to select a value for the leakage. The valid values for duct leakage are:
- 0.06/0.06 Extremely Sealed
- 0.09/0.15 Notably Sealed
- 0.12/0.24 Average Seal
- 0.24/0.47 Partially Sealed
- 0.35/0.70 Unsealed
Press the Duct Insulation row to select a value for the duct wall insulation. The valid values for duct wall insulation are:
Zone Conditioned Floor Area
Use Defaults | Use Custom
There are two choices for duct floor cooling and heating area. Select the [Use Defaults] option from the tab bar to use the same area that is used for infiltration. To use a different value select [Use Custom] from the tab bar. Whichever option you choose will grey out (disable) the other option.
Default Area From Infiltration
This displays the default heating area from the infiltration floor area.
This displays the default cooling area from the infiltration floor area.
When the [Use Custom] tab bar item is selected the Heating Area allows you to specify a duct floor heating area different from that used for infiltration.
When the [Use Custom] tab bar item is selected the Cooling Area allows you to specify a duct floor cooling area different from that used for infiltration.
Supply and Return Area
Supply / Return Estimated Area
These are estimates of the total surface area of the ductwork, calculated in a manner similar to entering the total area of a wall or window.
Start with an estimate of the length of each duct runs and their corresponding size. Using the size calculate the perimeter length of the duct (how far around) in inches. Divide the perimeter length by twelve (12) to yield decimal feet. Multiple the perimeter length (in decimal feet) by the length of the run to get the surface area (in square feet) of that particular run. Sum up the surface area of all the supply runs for supply estimated area, and all the return runs for return estimated area.
Ductwork View Part 2
Yes or no indicates whether or not Heating is calculated for this load.
Yes or no indicates whether or not Cooling is calculated for this load.