United States Stove 1602G, 1802G Chimney Requirements, Creosote Formation and Need For Removal

CHIMNEY REQUIREMENTS

A fireclay lined masonry or Class A 103HT All-Fuel Metal Insulated Chimney must be used in all airtight wood fur- nace installations. The minimum recommended flue size for the model 1602 is 6 inches, inside diameter and for the 1802, the recommended flue size is 8 inches, inside diam- eter. When making new chimney installations, always fol- low the chimney manufacturer’s instructions.

If at all possible, use the factory built, class A 103HT chim- ney mentioned above. They are safer and perform better than traditional masonry chimneys. If a masonry chimney is a must, be certain it has a fire clay liner and that it is intact, clean and recently inspected. And remember, masonry chimneys are far more prone to the formation of hazardous creosote.

1.The furnace should be the only heating using the

chimney flue . One furnace per flue outlet.

2.A masonry chimney should have a tile 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 (masonry or metal) and combustibles. (such as the house)

6.The chimney should extend at least 2 foot above the highest point of the house, or 2 foot above the point at which the chimney is 10 foot from the roof.

7.The chimney should be relatively straight and vertical.

8.The portion of an all-fuel metal chimney that extends above the roof should be well secured.

9.A masonry chimney should be built on footings and not attached to the house.

10.A rain cap, complete with an animal or bird screen, should be installed on top of the chimney.

CREOSOTE - FORMATION AND NEED

FOR REMOVAL

When wood is burned slowly, it produces tar and other organic vapors, which combine with expelled moisture to form creosote. The creosote vapors condense in the rela- tively cool chimney flue of a slow-burning fire. As a result, creosote residue accumulates on the flue lining. When ignited, this creosote makes an extremely hot fire.

The chimney connector and chimney should be inspected at least twice monthly during the heating season to deter- mine if a creosote build-up has occurred. If creosote has accumulated, it should be removed to reduce the risk of a chimney fire.

SMOKE PIPE INSTALLATION

Clearances to combustible materials (i.e. paneling, ceil- ing tile, sheet rock, plaster, draperies, casements or wood trim, etc.) will vary with the type of flue connection used. Be sure to maintain the specified clearances for your type of installation.

TYPE OF FLUE	REQUIRED
CONNECTION	CLEARANCE
24 Gauge or Heavier	18”
Single Wall Stainless Steel
or Black Pipe
Double Wall, Stainless Steel or	6” Model 1602
Double Wall, Black Pipe w/	8” Model 1802
Stainless Steel Inner wall
Class A 103HT All-Fuel or Equivalent	2”

According to NFPA standards, single wall stove pipes can be within 9” of combustibles provided an approved fire retardant material covered with 28 gauge sheet metal, spaced out 1” on non-combustible spacers, is utilized. See illustration.

When using a Class A or double wall flue pipe connection, follow the manufacturer’s instructions.

When constructing a single wall smoke pipe, the following guidelines must be observed.

1.The connector pipe should be 24 gauge or heavier stainless steel or black pipe.

2.Secure all joints with three #8 screws.

3.If the connector pipe must pass through a wall, an ap- proved insulated or ventilated thimble, at least three times the diameter of the smoke pipe must be used. (i.e. a 6” diameter smoke pipe needs an 18” thimble).

4.The connector pipe should never be used as a chimney.

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