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The minimum height of a chimney system
for the D.S. Furnace is 20 feet. The chimney
must exceed the roof of a house at a minimum
of 3 feet at any point of exit. In a pitched roof
installation the chimney must be 2 feet higher
than anything within a 10 foot radius of the
chimney. It is important to have a chimney draft
of 0.06 inches water column. It is required to
abide by the manufacturer’s instructions on
Class A chimneys as well as local building
codes. It is not recommended to build a chim-
ney on an addition that is lower than the main
part of your house.
Do Not extend the single
wall chimney connector past the inside of a
masonry chimney liner. Never connect this
unit to a chimney serving another appliance.
Should you have a problem with inadequate
draft you should see page 11.
Chimney Requirements
Locating Furnace
This furnace is to be installed maintaining
clearances as shown in illustration.
1. Set the furnace on a solid noncom
bustible floor.
2. Use a U.L. approved fire retardant
material for the floor mat.
3. The material must extend at least
16” in front of and 8” on either side
and back, and underneath the
chimney connector and extending at
least 2” on either side of the
chimney connector.
1. The furnace should be the only heating appliance using a chimney. One furnace per flue.
2. A masonry chimney should be a chimtek or stainless steel liner.
3. The masonry chimney should not have any missing mortar or loose bricks.
4. There should be no mortar or parts of the chimney blocking the chimney flue.
5. There should be a two inch clearance between any chimney except chimtek has zero clearance.
6. The chimney should extend at least 2’ above the highest point of the house, or 2’ above the point
at which the chimney is 10’ from the roof.
According to NFPA Standards single wall chim-
ney connector can be within 9” of combustible
provided an approved fire retardant material
covered with 28 gauge sheet metal, spaced out
1” on non-combustible spacers is utilized.
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