[Comment: When a reference is made
within this rule to a federal statutory provision, an industry consensus
standard, or any other technical publication, the specific date and title of
the publication as well as the name and address of the promulgating agency are
listed in rule
4101:8-44-01
of the Administrative Code. The application of the referenced standards shall
be limited and as prescribed in section 102.5 of rule
4101:8-1-01 of the
Administrative Code.]
SECTION
1501
GENERAL
1501.1
Outdoor
discharge.
The air removed by every
mechanical exhaust system shall be discharged to the outdoors in accordance
with Section 1504.3. Air shall not be exhausted into an attic, soffit, ridge
vent or crawl space.
Exception: Whole-house
ventilation-type attic fans that discharge into the attic space of dwelling
units having private attics shall be permitted.
SECTION 1502
CLOTHES DRYER EXHAUST
1502.1
General.
Clothes dryers shall be exhausted in
accordance with the manufacturer's instructions.
1502.2
Independent exhaust systems.
Dryer exhaust systems shall be independent of all other
systems and shall convey the moisture to the outdoors.
Exception:
This section shall not apply to listed and labeled
condensing (ductless) clothes dryers.
1502.3
Duct
termination.
Exhaust ducts shall terminate
on the outside of the building. Exhaust duct terminations shall be in
accordance with the dryer manufacturer's installation instructions. If the
manufacturer's instructions do not specify a termination location, the exhaust
duct shall terminate not less than 3 feet (914 mm) in any direction from
openings into buildings. Exhaust duct terminations shall be equipped with a
backdraft damper. Screens shall not be installed at the duct termination.
1502.3.1
Exhaust termination outlet and passageway size.
The passageway of dryer exhaust duct
terminals shall be undiminished in size and shall provide an open area of not
less than 12.5 square inches (8065
mm2).
1502.4
Dryer
exhaust ducts.
Dryer exhaust ducts shall
conform to the requirements of Sections 1502.4.1 through 1502.4.7.
1502.4.1
Material and size.
Exhaust ducts shall have a smooth interior finish and shall
be constructed of metal not less than 0.0157 inch ( 0.3950 mm) in thickness
(No. 28 gage). The duct shall be 4 inches (102 mm) nominal in
diameter.
1502.4.2
Duct installation.
Exhaust ducts shall be supported at intervals not to exceed
12 feet (3658 mm) and shall be secured in place. The insert end of the duct
shall extend into the adjoining duct or fitting in the direction of airflow.
Exhaust duct joints shall be sealed in accordance with Section 1601.4.1 and
shall be mechanically fastened. Ducts shall not be joined with screws or
similar fasteners that protrude more than1/8 -inch (
3.2 mm) into the inside of the duct. Where dryer exhaust ducts are enclosed in
wall or ceiling cavities, such cavities shall allow the installation of the
duct without deformation.
1502.4.3
Transition duct.
Transition ducts used to connect the dryer to the exhaust
duct system shall be a single length that is listed and labeled in accordance
with UL 2158A. Transition ducts shall be not greater than 8 feet (2438 mm) in
length. Transition ducts shall not be concealed within
construction.
1502.4.4
Dryer exhaust duct power ventilators.
Domestic dryer exhaust duct power
ventilators shall conform to UL 705 for use in dryer exhaust duct systems. The
dryer exhaust duct power ventilator shall be installed in accordance with the
manufacturer's instructions.
1502.4.5
Duct
length.
The maximum allowable exhaust duct
length shall be determined by one of the methods specified in Sections
1502.4.5.1 through 1502.4.5.3.
1502.4.5.1
Specified length.
The
maximum length of the exhaust duct shall be 35 feet (10 668 mm) from the
connection to the transition duct from the dryer to the outlet terminal. Where
fittings are used, the maximum length of the exhaust duct shall be reduced in
accordance with Table 1502.4.5.1. The maximum length of the exhaust duct does
not include the transition duct.
TABLE 1502.4.5.1
DRYER EXHAUST DUCT FITTING EQUIVALENT
LENGTH
|
DRYER EXHAUST DUCT FITTING
TYPE
|
EQUIVALENT
LENGTH
|
|
4-inch radius mitered 45-degree
elbow
|
2 feet 6 inches
|
|
4-inch radius mitered 90-degree
elbow
|
5 feet
|
|
6-inch radius smooth 45-degree
elbow
|
1 foot
|
|
6-inch radius smooth 90-degree
elbow
|
1 foot 9 inches
|
|
8-inch radius smooth 45-degree
elbow
|
1 foot
|
|
8-inch radius smooth 90-degree
elbow
|
1 foot 7 inches
|
|
10-inch radius smooth 45-degree
elbow
|
9 inches
|
|
10-inch radius smooth 90-degree
elbow
|
1 foot 6 inches
|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1
degree = 0.0175 rad.
1502.4.5.2
Manufacturer's instructions.
The size and maximum length of the exhaust duct shall be
determined by the dryer manufacturer's installation instructions. The
building official shall be provided with a copy of the
installation instructions for the make and model of the dryer at the
concealment inspection. In the absence of fitting equivalent length
calculations from the clothes dryer manufacturer, Table 1502.4.5.1 shall be
used.
1502.4.5.3
Dryer exhaust duct power ventilator.
The maximum length of the exhaust duct shall be determined
in accordance with the manufacturer's instructions for the dryer exhaust duct
power ventilator.
1502.4.6
Length
identification.
Where the exhaust duct
equivalent length exceeds 35 feet (10 668 mm), the equivalent length of the
exhaust duct shall be identified on a permanent label or tag. The label or tag
shall be located within 6 feet (1829 mm) of the exhaust duct
connection.
1502.4.7
Exhaust duct required.
Where space for a clothes dryer is provided, an exhaust duct
system shall be installed. Where the clothes dryer is not installed at the time
of occupancy the exhaust duct shall be capped or plugged in the space in which
it originates and identified and marked "future use."
Exception:
Where a listed condensing clothes dryer is installed prior
to occupancy of the structure.
1502.5
Protection required.
Protective shield plates shall be placed where nails or
screws from finish or other work are likely to penetrate the clothes dryer
exhaust duct. Shield plates shall be placed on the finished face of framing
members where there is less than 11/4 -inches (32
mm) between the duct and the finished face of the framing member. Protective
shield plates shall be constructed of steel, shall have a minimum thickness of
0.062 inch ( 1.6 mm) and shall extend not less than 2 inches (51 mm) above sole
plates and below top plates.
SECTION 1503
DOMESTIC COOKING EXHAUST
EQUIPMENT
1503.1
General.
Domestic cooking exhaust equipment shall comply with the
requirements of this section.
1503.2
Domestic
cooking exhaust.
Where domestic cooking
exhaust equipment is provided, it shall comply with one of the following:
1.
The fan for
overhead range hoods and downdraft exhaust equipment not integral with the
cooking appliance shall be listed and labeled in accordance with UL
507.
2.
Overhead range hoods and downdraft exhaust equipment
with integral fans shall comply with UL 507.
3.
Domestic cooking
appliances with integral downdraft exhaust equipment shall be listed and
labeled in accordance with ANSI Z 21.1 or UL 858.
4.
Microwave ovens
with integral exhaust for installation over the cooking surface shall be listed
and labeled in accordance with UL 923.
1503.2.1
Open-top broiler exhaust.
Domestic open-top broiler units shall be provided with a
metal exhaust hood having a thickness of not less than 0.0157 inch ( 0.3950 mm)
(No. 28 gage). Such hoods shall be installed with a clearance of not less
than1/4 -inch ( 6.4 mm) between the hood and the
underside of combustible material and cabinets. A clearance of not less than 24
inches (610 mm) shall be maintained between the cooking surface and combustible
material and cabinets. The hood width shall be not less than the width of the
broiler unit and shall extend over the entire unit.
Exception:
Broiler units that incorporate an integral exhaust system,
and that are listed and labeled for use without an exhaust hood, shall not be
required to have an exhaust hood.
1503.3
Exhaust
discharge.
Domestic cooking exhaust
equipment shall discharge to the outdoors through a duct. The duct shall have a
smooth interior surface, shall be air tight, shall be equipped with a backdraft
damper and shall be independent of all other exhaust systems. Ducts serving
domestic cooking exhaust equipment shall not terminate in an attic or crawl
space or areas inside the building.
Exception:
Where installed in accordance with the manufacturer's
instructions and where mechanical or natural ventilation is otherwise provided,
listed and labeled ductless range hoods shall not be required to discharge to
the outdoors.
1503.4
Duct material.
Ducts serving domestic cooking exhaust equipment shall be
constructed of galvanized steel, stainless steel or copper.
Exception:
Ducts for domestic kitchen cooking appliances equipped with
down-draft exhaust systems shall be permitted to be constructed of schedule 40
PVC pipe and fittings provided that the installation complies with all of the
following:
1.
The duct is installed under a concrete slab poured on
grade.
2.
The underfloor trench in which the duct is installed is
completely backfilled with sand or gravel.
3.
The PVC duct
extends not more than 1 inch (25 mm) above the indoor concrete floor
surface.
4.
The PVC duct extends not more than 1 inch (25 mm) above
grade outside of the building.
5.
The PVC ducts are
solvent cemented.
1503.5
Kitchen
exhaust rates.
Where domestic kitchen
cooking appliances are equipped with ducted range hoods or down-draft exhaust
systems, the fans shall be sized in accordance with Section
1505.4.4.
1503.6
Makeup air required.
Where one or more gas, liquid or solid fuel-burning
appliance that is neither direct-vent nor uses a mechanical draft venting
system is located within a dwelling unit's air barrier, each exhaust system
capable of exhausting in excess of 400 cubic feet per minute ( 0.19
m3/s) shall be mechanically or passively provided
with makeup air at a rate approximately equal to the exhaust air rate. Such
makeup air systems shall be equipped with not fewer than one damper complying
with Section 1503.6.2.
Exceptions:
1.
If an
exhaust hood system's manufacturer's instructions and/or specifications differ
from this requirement, the system shall be installed per the manufacturer's
instructions and/or specifications.
2.
Makeup air is not
required for exhaust systems installed for the exclusive purpose of space
cooling and intended to be operated only when windows or other air inlets are
open.
1503.6.1
Location.
Kitchen
exhaust makeup air shall be discharged into the same room in which the exhaust
system is located or into rooms or duct systems that communicate through one or
more permanent openings with the room in which such exhaust system is located.
Such permanent openings shall have a net cross-sectional area not less than the
required area of the makeup air supply openings.
1503.6.2
Makeup
air dampers.
Where makeup air is required
by Section 1503.6, makeup air dampers shall comply with this section. Each
damper shall be a gravity damper or an electrically operated damper that
automatically opens when the exhaust system operates. Dampers shall be located
to allow access for inspection, service, repair and replacement without
removing permanent construction or any other ducts not connected to the damper
being inspected, serviced, repaired or replaced. Gravity or barometric dampers
shall not be used in passive makeup air systems except where the dampers are
rated to provide the design makeup airflow at a pressure differential of 0.01
in. w.c. (3 Pa) or less.
SECTION 1504
EXHAUST DUCTS AND EXHAUST
OPENINGS
1504.1
Duct construction.
Where exhaust duct construction is not specified in this
chapter, construction shall comply with Chapter 16.
1504.2
Duct
length.
The length of exhaust and supply
ducts used with ventilating equipment shall not exceed the lengths determined
in accordance with Table 1504.2.
Exception:
Duct length shall not be limited where the duct system
complies with the manufacturer's design criteria or where the flow rate of the
installed ventilating equipment is verified by the installer or approved third
party using a flow hood, flow grid or other airflow measuring
device.
TABLE 1504.2
DUCT LENGTH
|
DUCT TYPE
|
FLEX DUCT
|
SMOOTH-WALL
DUCT
|
|
Fan
airflow
rating
(CFM @
0.25 inch
wca)
|
50
|
80
|
100
|
125
|
150
|
200
|
250
|
300
|
50
|
80
|
100
|
125
|
150
|
200
|
250
|
300
|
|
Diameterb (inches)
|
Maximum
lengthc,d,e
(feet)
|
|
3
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
5
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
|
4
|
56
|
4
|
X
|
X
|
X
|
X
|
X
|
X
|
114
|
31
|
10
|
X
|
X
|
X
|
X
|
X
|
|
5
|
NL
|
81
|
42
|
16
|
2
|
X
|
X
|
X
|
NL
|
152
|
91
|
51
|
28
|
4
|
X
|
X
|
|
6
|
NL
|
NL
|
158
|
91
|
55
|
18
|
1
|
X
|
NL
|
NL
|
NL
|
168
|
112
|
53
|
25
|
9
|
|
7
|
NL
|
NL
|
NL
|
NL
|
161
|
78
|
40
|
19
|
NL
|
NL
|
NL
|
NL
|
NL
|
148
|
88
|
54
|
|
8 and above
|
NL
|
NL
|
NL
|
NL
|
NL
|
189
|
111
|
69
|
NL
|
NL
|
NL
|
NL
|
NL
|
NL
|
198
|
133
|
For SI: 1 inch = 25.4 mm, 1 foot = 304.8
mm.
a.
Fan airflow
rating shall be in accordance with ANSI/AMCA 210-ANSI/ASHRAE 51.
b.
For
noncircular ducts, calculate the diameter as four times the cross-sectional
area divided by the perimeter.
c.
This table
assumes that elbows are not used. Fifteen feet of allowable duct length shall
be deducted for each elbow installed in the duct run.
d.
NL = no limit
on duct length of this size.
e.
X = not
allowed. Any length of duct of this size with assumed turns and fittings will
exceed the rated pressure drop.
1504.3
Exhaust
openings.
Air exhaust openings shall
terminate as follows:
1.
Not less than 3 feet (914 mm) from property
lines.
2.
Not less than 3 feet (914 mm) from gravity air intake
openings, operable windows and doors.
3.
Not less than 10
feet (3048 mm) from mechanical air intake openings except where the exhaust
opening is located not less than 3 feet (914 mm) above the air intake opening.
Openings shall comply with Sections 303.5.2 and 303.6.
SECTION 1505
MECHANICAL
VENTILATION
1505.1
General.
Where local exhaust or whole-house mechanical ventilation is
provided, the equipment shall be designed in accordance with this
section.
1505.2
Recirculation of air.
Exhaust air from bathrooms and toilet rooms shall not be
recirculated within a residence or circulated to another dwelling unit and
shall be exhausted directly to the outdoors. Exhaust air from bathrooms, toilet
rooms and kitchens shall not discharge into an attic, crawl space or other
areas inside the building. This section shall not prohibit the installation of
ductless range hoods in accordance with the exception to Section
1503.3.
1505.3
Exhaust equipment.
Exhaust equipment serving single dwelling units shall be
listed and labeled as providing the minimum required airflow in accordance with
ANSI/AMCA 210-ANSI/ASHRAE 51.
1505.4
Whole-house mechanical ventilation system.
Whole-house mechanical ventilation systems shall be designed
in accordance with Sections 1505.4.1 through 1505.4.4.
1505.4.1
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.
1505.4.2
System controls.
The whole-house mechanical ventilation system shall be
provided with controls that enable manual override.
1505.4.3
Mechanical ventilation rate.
The whole-house mechanical ventilation system shall provide
outdoor air at a continuous rate as determined in accordance with Table
1505.4.3(1) or Equation 15-1.
Click to
view image
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 1505.4.3(1) is multiplied by the factor determined in
accordance with Table 1505.4.3(2).
TABLE 1505.4.3(1)
CONTINUOUS WHOLE-HOUSE MECHANICAL
VENTILATION SYSTEM AIRFLOW RATE REQUIREMENTS
|
DWELLING UNIT FLOOR AREA (square
feet)
|
NUMBER OF
BEDROOMS
|
|
0 - 1
|
2 - 3
|
4 - 5
|
6 - 7
|
> 7
|
|
Airflow in
CFM
|
|
< 1,500
|
30
|
45
|
60
|
75
|
90
|
|
1,501 -
3,000
|
45
|
60
|
75
|
90
|
105
|
|
3,001 -
4,500
|
60
|
75
|
90
|
105
|
120
|
|
4,501 -
6,000
|
75
|
90
|
105
|
120
|
135
|
|
6,001 -
7,500
|
90
|
105
|
120
|
135
|
150
|
|
=> 7,500
|
105
|
120
|
135
|
150
|
165
|
For SI: 1 square foot = 0.0929
m2, 1 cubic foot per minute = 0.0004719
m3/s.
TABLE 1505.4.3(2)
INTERMITTENT WHOLE-HOUSE MECHANICAL
VENTILATION RATE
FACTORSa,b
|
RUN-TIME PERCENTAGE IN EACH
4-HOUR SEGMENT
|
25%
|
33%
|
50%
|
66%
|
75%
|
100%
|
|
Factora
|
4
|
3
|
2
|
1.5
|
1.3
|
1.0
|
a.
For
ventilation system run time values between those given, the factors are
permitted to be determined by interpolation.
b.
Extrapolation
beyond the table is prohibited.
1505.4.4
Local
exhaust rates.
Local exhaust systems shall
be designed to have the capacity to exhaust the minimum airflow rate determined
in accordance with Table 1505.4.4.
TABLE 1505.4.4
MINIMUM REQUIRED LOCAL EXHAUST RATES FOR
ONE-, TWO-AND THREE FAMILY DWELLINGS
|
AREA TO BE
EXHAUSTED
|
EXHAUST
RATES
|
|
Kitchens
|
100 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.
Replaces: 4101:8-15-01
Notes
Ohio Admin. Code 4101:8-15-01
Effective:
7/1/2019
Five Year Review (FYR) Dates:
07/01/2024
Promulgated
Under: 119.03
Statutory
Authority: 3781.10(A)(1)
Rule Amplifies:
3781.01,
4740.14,
3791.04,
3781.11,
3781.10,
3781.06
Prior
Effective Dates: 01/01/2013, 07/01/2014
