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// CODE SNIPPET

501.4.1 Makeup Air in New Dwelling Units

Minnesota Mechanical Code 2015 > 5 Exhaust Systems > 501 General > 501.4 Pressure Equalization > 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:
  1. 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.
  2. 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)
0.150.090.060.03
b) conditioned floor
area (sf)
————
(including unfinished basements)
Estimated House
Infiltration (cfm):
[1a × 1b]
————
2. Exhaust Capacity
a) clothes dryer135135135135
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.
  1. Use this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.
  2. Use this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included.
  3. 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.
  4. 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 ...
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Makeup air shall be supplied to existing dwelling units when any of the following conditions occur: 1. If a dwelling unit was constructed ...
Minnesota Mechanical Code 2015 > 5 Exhaust Systems > 501 General > 501.4 Pressure Equalization > 501.4.3 Additions, Alterations, or Installations of Mechanical Systems in Existing Dwelling Units
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Provisions shall be made for makeup air to replace that being exhausted. Openings for makeup air shall be located to avoid intake of exhaust air ...
2020 Minnesota Mechanical Code > 11 Refrigeration > 1105 Machinery Room, General Requirements > 1105.6 Ventilation > 1105.6.2 Makeup Air
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Provisions shall be made for makeup air to replace that being exhausted. Openings for makeup air shall be located to avoid intake of exhaust air ...
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