Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1.
Section 503.2.2.
IFGC Section 503.2.2 is deleted.
Subp. 2. [Repealed, 34 SR 537]
Subp. 3.
Section 503.5.5.
IFGC Section 503.5.5 is amended to read as follows:
503.5.5
Size of chimneys. The
effective area of a chimney venting system serving listed appliances with draft
hoods, Category I appliances, and other appliances listed for use with Type B
vents shall be in accordance with IFGC Section 504 or other approved
engineering methods.
Exceptions:
1. As an alternate method of sizing an
individual chimney venting system for a single appliance with a draft hood, the
effective areas of the vent connector and chimney flue shall be not less than
the area of the appliance flue collar or draft hood outlet, nor greater than
four times the draft hood outlet area.
2. As an alternate method for sizing a
chimney venting system connected to two appliances with draft hoods, the
effective area of the chimney flue shall be not less than the area of the
larger draft hood outlet plus 50 percent of the area of the smaller draft hood
outlet, nor greater than four times the smallest draft hood outlet area.
Where an incinerator is vented by a chimney serving other gas
utilization equipment, the gas input to the incinerator shall not be included
in calculating chimney size, provided the chimney flue diameter is not less
than 1 inch (25.4 mm) larger in equivalent diameter than the diameter of the
incinerator flue outlet.
Subp. 4.
Section 503.5.6.
IFGC Section 503.5.6 is amended to read as follows:
503.5.6
Inspection of chimneys.
Before replacing an existing appliance or connecting a vent connector to a
chimney, the chimney passageway shall be examined to ascertain that it is clear
and free of obstructions and it shall be cleaned if previously used for venting
solid or liquid fuel-burning appliances or fireplaces.
Exception: Existing chimneys shall be lined in accordance
with amended IFGC Section 501.12 unless otherwise approved by the building
official.
Subp.
5. [Repealed, 34 SR 537]
Subp.
6.
Section 503.6.10.1.
IFGC section 503.6.10.1 is amended to read as follows:
503.6.10.1
Category I
appliances. The sizing of natural draft venting systems serving one or
more listed appliances equipped with a draft hood or appliances listed for use
with Type B gas vent, installed in a single story of a building, shall be in
accordance with one of the following methods:
1. The provisions of Section 504.
2. For sizing an individual gas vent for a
single draft-hood-equipped appliance, the effective area of the vent connector
and the gas vent shall be not less than the area of the appliance draft hood
outlet, nor greater than four times the draft hood outlet area.
3. For sizing a gas vent connected to two
appliances with draft hoods, the effective area of the vent shall be not less
than the area of the larger draft hood outlet plus 50 percent of the area of
the smaller draft hood outlet, nor greater than four times the smaller draft
hood outlet area.
4. Approved
engineering practices.
Subp. 7.
Section 503.7.8.
IFGC Section 503.7.8 is amended to read as follows:
503.7.8
Size of single-wall metal
pipe. A venting system constructed of single-wall metal pipe shall be
sized in accordance with one of the following methods and the equipment
manufacturer's instructions:
1. For a draft
hood-equipped appliance, in accordance with IFGC Section 504.
2. For a venting system for a single
appliance with a draft hood, the areas of the connector and the pipe each shall
be not less than the area of the appliance flue collar or draft hood outlet,
whichever is smaller. The vent area shall not be greater than four times the
draft hood outlet area.
3. Other
approved engineering methods.
Subp. 8. [Repealed, 34 SR 537]
Subp. 9.
Section 503.10.7.
IFGC Section 503.10.7 is amended to read as follows:
503.10.7
Joints. Joints between
sections of connector piping and connections to flue collars and hood outlets
shall be fastened by one of the following methods:
1. Three sheet metal screws equally spaced in
accessible locations on the circumference of the vent.
2. Vent connectors of listed vent material
assembled and connected to flue collars or draft hood outlets in accordance
with the manufacturers' instructions.
3. Other approved means.
Statutory Authority: MS s 16B.59; 16B.61;
16B.64;
326B.101;
326B.106;
326B.13
