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// CODE SNIPPET

M1505.4 Whole-House Mechanical Ventilation System

Residential Code 2018 of Kansas > 15 Exhaust Systems > M1505 Mechanical Ventilation > M1505.4 Whole-House Mechanical Ventilation System
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Whole-house mechanical ventilation systems shall be designed in accordance with Sections M1505.4.1 through M1505.4.4.

M1505.4.1 System Design

The whole-house ventilation system shall consist of one or more supply or exhaust fans, or a combination of such, and associated ducts and controls. Local exhaust or supply fans are permitted to serve as such a system. Outdoor air ducts connected to the return side of an air handler shall be considered as providing supply ventilation.

M1505.4.2 System Controls

The whole-house mechanical ventilation system shall be provided with controls that enable manual override.

M1505.4.3 Mechanical Ventilation Rate

The whole house mechanical ventilation system shall provide outdoor air at a continuous rate as determined in accordance with Table M1505.4.3(1) or Equation 15-1.
(Equation 15-1)
Exception: The whole-house mechanical ventilation system is permitted to operate intermittently where the system has controls that enable operation for not less than 25 percent of each 4-hour segment and the ventilation rate prescribed in Table M1505.4.3(1) is multiplied by the factor determined in accordance with Table M1505.4.3(2).
TABLE M1505.4.3(1)
CONTINUOUS WHOLE-HOUSE MECHANICAL VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS
DWELLING UNIT
FLOOR AREA
(square feet)
NUMBER OF BEDROOMS
0 — 12 — 34 — 56 — 7> 7
Airflow in CFM
< 1,5003045607590
1,501 — 3,00045607590105
3,001 — 4,500607590105120
4,501 — 6,0007590105120135
6,001 — 7,50090105120135150
> 7,500105120135150165
For SI: 1 square foot = 0.0929 m2, 1 cubic foot per minute = 0.0004719 m3/s.
TABLE M1505.4.3(2)
INTERMITTENT WHOLE-HOUSE MECHANICAL VENTILATION RATE FACTORSa, b
RUN-TIME PERCENTAGE IN EACH 4-HOUR
SEGMENT
25%33%50%66%75%100%
Factora4321.51.31.0
  1. For ventilation system run time values between those given, the factors are permitted to be determined by interpolation.
  2. Extrapolation beyond the table is prohibited.

M1505.4.4 Local Exhaust Rates

Local exhaust systems shall be designed to have the capacity to exhaust the minimum airflow rate determined in accordance with Table M1505.4.4.
TABLE M1505.4.4
MINIMUM REQUIRED LOCAL EXHAUST RATES FOR ONE- AND TWO-FAMILY DWELLINGS
AREA TO BE
EXHAUSTED
EXHAUST RATES
Kitchens100 cfm intermittent or 25 cfm continuous
Bathrooms-Toilet
Rooms
Mechanical exhaust capacity of 50 cfm
intermittent or 20 cfm continuous
For SI: 1 cubic foot per minute = 0.0004719 m3/s.

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