Thread: Furnace room entry from bed room/bath

Do we need water heater direct vented out,if furnace room entry from bedroom and/or bathroom?
Sanjeev Supayia
Brampton Home Inspections Mississauga Home Inspector Toronto - Home

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Originally Posted by sanjeev supayia

Do we need water heater direct vented out,if furnace room entry from bedroom and/or bathroom?
Sanjeev Supayia
Brampton Home Inspections Mississauga Home Inspector Toronto - Home

You need to check local requirements, but...
In most if not all locations, the door to the room must be sealed, combustion make-up air cannot be drawn from the bedroom.

"G2406.2 (303.3) Prohibited locations. Appliances shall not
be located in sleeping rooms, bathrooms, toilet rooms, storage
closets or surgical rooms, or in a space that opens only into such
rooms or spaces, except where the installation complies with
one of the following:

1. The appliance is a direct-vent appliance installed in
accordance with the conditions of the listing and the
manufacturer’s instructions.

2. Vented room heaters, wall furnaces, vented decorative
appliances, vented gas fireplaces, vented gas fireplace
heaters and decorative appliances for installation in
vented solid fuel-burning fireplaces are installed in
rooms that meet the required volume criteria of Section
G2407.5.

3. A single wall-mounted unvented room heater is installed
in a bathroom and such unvented room heater is
equipped as specified in Section G2445.6 and has an
input rating not greater than 6,000 Btu/h (1.76 kW). The
bathroom shall meet the required volume criteria of Section
G2407.5.

4. A single wall-mounted unvented room heater is installed
in a bedroom and such unvented room heater is equipped
as specified in Section G2445.6 and has an input rating
not greater than 10,000 Btu/h (2.93 kW). The bedroom
shall meet the required volume criteria of Section
G2407.5.

5. The appliance is installed in a room or space that opens
only into a bedroom or bathroom, and such room or
space is used for no other purpose and is provided with a
solid weather-stripped door equipped with an approved
self-closing device. All combustion air shall be taken
directly from the outdoors in accordance with Section
G2407.6."

"Code Commentary: The intent of this section is to prevent
fuel-fired appliances from being installed in rooms and spaces
where the combustion process could pose a threat to the occupants. Potential
threats include depleted oxygen levels; elevated levels
of carbon dioxide, nitrous oxides, carbon monoxide,
and other combustion gases; ignition of combustibles and
elevated levels of flammable gases.

In small rooms such as bedrooms and bathrooms, the
doors are typically closed when the room is occupied,
which could allow combustion gases to build up to
life-threatening levels. In bedrooms, sleeping occupants
would not be alert to or aware of impending danger.

If an appliance obtains combustion air from a room or
space, it communicates with the atmosphere in that room
or space whether or not it is installed in that room or space.
An appliance might be in a room, closet or alcove and obtain
combustion air from an adjacent room, so Section
G2406.2 is worded to address the location of an appliance
in the rooms listed and in spaces that open only into such
rooms. In other words, an appliance in a closet accessed
from a bedroom is no different from an appliance located
within the bedroom. It is not the intent of this section
to prevent combustion air from being taken from a
bedroom, bathroom, etc. as evidenced in Items 2, 3
and 4. For example, the volume of a bedroom could be
added to the volume of other rooms for the purpose of
providing indoor combustion air for an appliance not
installed in a location prohibited by this section if openings
are installed to conjoin the space volumes in accordance
with Section G2407.5.3. If an appliance obtains
combustion air from a room, the appliance
combustion chamber would be open to the room and
the appliance must be considered to be in that room.
Item 1 recognizes that direct-vent appliances have
sealed combustion chambers and obtain all combustion
air directly from the outdoors. The appliance combustion
chambers do not communicate with the room
atmosphere.

Item 2 requires that the room be able to supply the
necessary combustion air by infiltration as specified in
Section G2407.5. Note that Item 2 includes both
vented decorative appliances and vented gas fireplaces
which are both addressed by ANSI Z21.50 and
are essentially the same appliance, known by different
names. Vented gas fireplace heaters (Z21.88) were
also added to Item 2.

Items 3 and 4 allow the installation of a single
wall-mounted unvented room heater in bathrooms and
bedrooms if the heaters are equipped with oxygen depletion
safety shutoff systems, are limited in Btu input rating
and the space is capable of supplying indoor combustion
air in accordance with Section G2407.5. These exceptions
specify “wall-mounted” heaters, which are fully enclosed
and less susceptible to tampering and other conditions that
might affect the combustion process. Items 3 and 4 would
not apply to room heaters that stand on the floor or fasten to
a fireplace hearth or ventless firebox hearth [see Commentary
Figure G2406.2(1)].

Item 5 would allow installation of fuel-fired appliances
within a separate dedicated space that is accessed from
the rooms and spaces listed in this section. A separated
space containing the appliance must be open to the outdoors
in accordance with Section G2407.6, and the access
door to the space must be solid and weather-stripped to
prevent communication between atmospheres in the separated
spaces. The door must also be self-closing and not
rely on occupants to keep it closed. The enclosure must not
be used for storage or any other purpose. The intent is to
isolate the appliance(s) from the rooms listed in this section
and to obtain all combustion air directly from the outdoors
[see Commentary Figure G2406.2(2)]. This item can be
used to avoid relocating an appliance when an existing appliance
installed in a prohibited location needs to be replaced
[see Commentary Figure G2406.2(2)]."

Originally Posted by Scott Patterson

You need to check local requirements, but...
In most if not all locations, the door to the room must be sealed, combustion make-up air cannot be drawn from the bedroom.

Scott You are right

Originally Posted by Joe Funderburk

"G2406.2 (303.3) Prohibited locations. Appliances shall not
be located in sleeping rooms, bathrooms, toilet rooms, storage
closets or surgical rooms, or in a space that opens only into such
rooms or spaces, except where the installation complies with
one of the following:

1. The appliance is a direct-vent appliance installed in
accordance with the conditions of the listing and the
manufacturer’s instructions.

2. Vented room heaters, wall furnaces, vented decorative
appliances, vented gas fireplaces, vented gas fireplace
heaters and decorative appliances for installation in
vented solid fuel-burning fireplaces are installed in
rooms that meet the required volume criteria of Section
G2407.5.

3. A single wall-mounted unvented room heater is installed
in a bathroom and such unvented room heater is
equipped as specified in Section G2445.6 and has an
input rating not greater than 6,000 Btu/h (1.76 kW). The
bathroom shall meet the required volume criteria of Section
G2407.5.

4. A single wall-mounted unvented room heater is installed
in a bedroom and such unvented room heater is equipped
as specified in Section G2445.6 and has an input rating
not greater than 10,000 Btu/h (2.93 kW). The bedroom
shall meet the required volume criteria of Section
G2407.5.

5. The appliance is installed in a room or space that opens
only into a bedroom or bathroom, and such room or
space is used for no other purpose and is provided with a
solid weather-stripped door equipped with an approved
self-closing device. All combustion air shall be taken
directly from the outdoors in accordance with Section
G2407.6."

"Code Commentary: The intent of this section is to prevent
fuel-fired appliances from being installed in rooms and spaces
where the combustion process could pose a threat to the occupants. Potential
threats include depleted oxygen levels; elevated levels
of carbon dioxide, nitrous oxides, carbon monoxide,
and other combustion gases; ignition of combustibles and
elevated levels of flammable gases.

In small rooms such as bedrooms and bathrooms, the
doors are typically closed when the room is occupied,
which could allow combustion gases to build up to
life-threatening levels. In bedrooms, sleeping occupants
would not be alert to or aware of impending danger.

If an appliance obtains combustion air from a room or
space, it communicates with the atmosphere in that room
or space whether or not it is installed in that room or space.
An appliance might be in a room, closet or alcove and obtain
combustion air from an adjacent room, so Section
G2406.2 is worded to address the location of an appliance
in the rooms listed and in spaces that open only into such
rooms. In other words, an appliance in a closet accessed
from a bedroom is no different from an appliance located
within the bedroom. It is not the intent of this section
to prevent combustion air from being taken from a
bedroom, bathroom, etc. as evidenced in Items 2, 3
and 4. For example, the volume of a bedroom could be
added to the volume of other rooms for the purpose of
providing indoor combustion air for an appliance not
installed in a location prohibited by this section if openings
are installed to conjoin the space volumes in accordance
with Section G2407.5.3. If an appliance obtains
combustion air from a room, the appliance
combustion chamber would be open to the room and
the appliance must be considered to be in that room.
Item 1 recognizes that direct-vent appliances have
sealed combustion chambers and obtain all combustion
air directly from the outdoors. The appliance combustion
chambers do not communicate with the room
atmosphere.

Item 2 requires that the room be able to supply the
necessary combustion air by infiltration as specified in
Section G2407.5. Note that Item 2 includes both
vented decorative appliances and vented gas fireplaces
which are both addressed by ANSI Z21.50 and
are essentially the same appliance, known by different
names. Vented gas fireplace heaters (Z21.88) were
also added to Item 2.

Items 3 and 4 allow the installation of a single
wall-mounted unvented room heater in bathrooms and
bedrooms if the heaters are equipped with oxygen depletion
safety shutoff systems, are limited in Btu input rating
and the space is capable of supplying indoor combustion
air in accordance with Section G2407.5. These exceptions
specify “wall-mounted” heaters, which are fully enclosed
and less susceptible to tampering and other conditions that
might affect the combustion process. Items 3 and 4 would
not apply to room heaters that stand on the floor or fasten to
a fireplace hearth or ventless firebox hearth [see Commentary
Figure G2406.2(1)].

Item 5 would allow installation of fuel-fired appliances
within a separate dedicated space that is accessed from
the rooms and spaces listed in this section. A separated
space containing the appliance must be open to the outdoors
in accordance with Section G2407.6, and the access
door to the space must be solid and weather-stripped to
prevent communication between atmospheres in the separated
spaces. The door must also be self-closing and not
rely on occupants to keep it closed. The enclosure must not
be used for storage or any other purpose. The intent is to
isolate the appliance(s) from the rooms listed in this section
and to obtain all combustion air directly from the outdoors
[see Commentary Figure G2406.2(2)]. This item can be
used to avoid relocating an appliance when an existing appliance
installed in a prohibited location needs to be replaced
[see Commentary Figure G2406.2(2)]."

Thanks Joe sharing your knowledge with us