// CODE SNIPPET
501.4.1 Makeup Air in New Dwelling Units
JUMP TO FULL CODE CHAPTER
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.
Related Code Sections
501.4.1 Exhaust Systems, Makeup Air in New Dwelling Units
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 ...
Minnesota Mechanical Code 2015 > 5 Exhaust Systems > 501 General > 501.4 Pressure Equalization > 501.4.1 Makeup Air in New Dwelling Units
501.4.1 Exhaust Systems, Makeup Air in New Dwellings
Makeup air quantity for new dwellings shall be determined by using Table 501.4.1 and shall be supplied in accordance with section 501.4.2 ...
2020 Minnesota Mechanical Code > 5 Exhaust Systems > 501 General > 501.4 Pressure Equalization > 501.4.1 Makeup Air in New Dwellings
508.1 Exhaust Systems, Makeup Air
Makeup air shall be supplied during the operation of commercial kitchen exhaust systems that are provided for commercial food heat-processing ...
Minnesota Mechanical Code 2015 > 5 Exhaust Systems > 508 Commercial Kitchen Makeup Air > 508.1 Makeup Air
501.4.2.3 Exhaust Systems, Makeup Air Location
Makeup air requirements of 175 cubic feet per minute (cfm) (0.084 m 3 /s) and greater shall be introduced to the dwelling in one of the following ...
2020 Minnesota Mechanical Code > 5 Exhaust Systems > 501 General > 501.4 Pressure Equalization > 501.4.2 Makeup Air Supply > 501.4.2.3 Makeup Air Location
501.4.2 Exhaust Systems, Makeup Air Supply
interlocked with the exhaust system.
Table 501.4.2
Makeup Air Opening Sizing Table for New and Existing Dwellings
Type of opening ...
2020 Minnesota Mechanical Code > 5 Exhaust Systems > 501 General > 501.4 Pressure Equalization > 501.4.2 Makeup Air Supply