Astria Craftsman STP2 Manual de Instruções de Instalação e Operação - Página 10

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1. Replacement Parts

10' FOOT RULE

All chimney terminations must extend a minimum of 3 feet above the

highest point where it passes through the roof and must be at least 2

feet above roof with a 10 foot horizontal span (see Figure 20).

IMPORTANT: If an exposed portion of chimney is greater than 4 feet

above the roof line, use support wires to keep chimney secure. Sup-

port wires may be attached to outer pipe of chimney with screws, if

screws do not penetrate inner flue pipe.

Figure 20- 10 Foot Rule

MINIMUM/MAXIMUM CHIMNEY HEIGHT

The minimum height of the chimney (measured from the base of the

fireplace to the flue gas outlet-end of pipe) is 16 feet for a straight run,

16 feet minimum for a run with 1 elbow set and 25 feet minimum for

a run with 2 elbow sets. (A set consists of one starter elbow and one

return elbow.)

Uncommon circumstances such as neighboring hills, tall trees, or

strong wind areas can cause down drafts in chimney system. In such

cases, going beyond the minimum recommended height would be

preferable to provide a better draw.

The fireplace height approved for any chimney run with this fireplace

system is 40 feet measured from bottom of firebox to flue outlet-end

of pipe (see Figure 21).

VENTING INSTALLATION Continued

Storm

Collar

PENETRATING ROOF

To maintain a 1" clearance to pipe on a roof with a pitch, a rectangular

opening must be cut.

1. Determine center point where pipe will penetrate the roof.

2. Determine center point of the roof. Pitch is the distance the roof

drops over a given span, usually 12". A 6/12 pitch means that the

roof drops 6" for each 12" measure horizontally down from roof

rafters.

3. Use roof opening chart (Figure 22, page 11) to determine correct

opening length and flashing required.

4. Remove shingles around opening measured. Cut out this section.

Astria.US.com

RTL-8DM

Flashing

MINIMUM

HEIGHT

15 FT.

(4.5m)

Firestop

Spacer

Figure 21 - Maximum Chimney Height

ETL-8DM

MAXIMUM

HEIGHT

CHASE

TERMINATION

40 FT.

(12m)

126650-01B