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Desired Outcome:
Desired Outcome:
Install transfer grill at the CAZ boundary to provide sufficient combustion air from the interior of the home so that appliances in the CAZ will have sufficient ventilation to permit complete combustion of the gas.
Install transfer grill at the CAZ boundary to provide sufficient combustion air from the interior of the home so that appliances in the CAZ will have sufficient ventilation to permit complete combustion of the gas.
SWS Detail: 5.0502.1 Combustion Air-Fuel-Fired Appliances
Before
Before
After
After
Steps
Steps
- Determine location of interior Combustion Air Opening
Follow work order and IRC G2407.5 or IFGC 304.5 to determine appropriate combustion air duct sizing and location
2. Outline
2. Outline
Draw outline of hole onto drywall or door
3. Cut hole
3. Cut hole
Carefully cut the transfer grill hole.
Support the cutout while cutting to prevent chipping or tearing.
4. Add blocking as needed
4. Add blocking as needed
If wiring, venting, or plumbing piping are now visible blocking and sealing must be done to separate from the living space
5. Seal wall cavity
5. Seal wall cavity
If the wall communicates to the exterior, block and seal the entire wall cavity
6. Install grilles
6. Install grilles
Mechanically fasten louvered grills on finished sides of walls and on both sides of doors.
7. Worst Case Draft Test
7. Worst Case Draft Test
Conduct a Worst Case draft test to verify Category I, II and III appliances are venting safely before leaving home for the day.
Testing shall be recorded using the the WAP Worst Case Draft Test form.
8. Client Ed
8. Client Ed
Educate the client on purpose of combustion air opening. Warn client not to block or plug the opening
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