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501.4.1 Makeup Air in New Dwelling Units
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Makeup air quantity for new dwelling units shall be determined by using IMC Table 501.4.1 and shall be supplied in accordance with IMC Section 501.4.2.
Exception: Makeup air provisions of IMC Section 501.4.1 are not required when any of the following are demonstrated:
- A test is performed according to ASTM Standard E1998-02, Standard Guide for Assessing Depressurization-Induced Backdrafting and Spillage from Vented Combustion Appliances, and documentation is provided that the vented combustion appliances continue to operate within established parameters of the test.
- A test approved by the building official verifies proper operation of vented combustion appliances.
TABLE 501.4.1
PROCEDURE TO DETERMINE MAKEUP AIR QUANTITY FOR EXHAUST APPLIANCES IN DWELLING UNITS
| ONE OR MULTIPLE POWER VENT OR DIRECT VENT APPLIANCES OR NO COMBUSTION APPLIANCESA | ONE OR MULTIPLE FAN- ASSISTED APPLIANCES AND POWER VENT OR DIRECT VENT APPLIANCESB | ONE ATMOSPHERICALLY VENTED GAS OR OIL APPLIANCE OR ONE SOLID FUEL APPLIANCEC | MULTIPLE APPLIANCES THAT ARE ATMOSPHERICALLY VENTED GAS OR OIL APPLIANCES OR SOLID FUEL APPLIANCESD | |
| 1. Use the Appropriate Column to Estimate House Infiltration | ||||
| a) pressure factor (cfm/sf) | 0.15 | 0.09 | 0.06 | 0.03 |
| b) conditioned floor area (sf) | — | — | — | — |
| (including unfinished basements) | ||||
| Estimated House Infiltration (cfm): [1a × 1b] | — | — | — | — |
| 2. Exhaust Capacity | ||||
| a) clothes dryer | 135 | 135 | 135 | 135 |
| b) 80% of largest exhaust rating (cfm): | — | — | — | — |
| (not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust) | ||||
| c) 80% of next largest exhaust rating (cfm): | not applicable | — | — | — |
| (not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust) | ||||
| Total Exhaust Capacity (cfm): [2a+2b+2c] | — | — | — | — |
| 3. Makeup Air Requirement | ||||
| a) Total Exhaust Capacity (from above) | — | — | — | — |
| b) Estimated House Infiltration (from above) | — | — | — | — |
| Makeup Air Quality (cfm): [3a - 3b] | — | — | — | — |
| (if value is negative, no makeup air is needed | ||||
| 4. For Makeup Air Opening Sizing, refer to Table 501.4.2. | ||||
Use this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances. Use this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included. Use this column if there is one atmospherically vented (other than fan-assisted) gas or oil appliance per venting system or one solid fuel appliance. Use this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil appliances and solid fuel appliances.
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