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RT-SVX072A-EN 67
Figure 38. Full perimeter curb with pedestal (20 to 75 ton units built prior to 1991)
Table 34. 20 to 75 ton roof curb dimensions, downflow (units built prior to 1991)
Model
Unit
Size
W L A B C D E F T U
SAHC
20, 25,
30
7'–1/2" 21'–3 3/4" 5'–8 3/4" 2'–5 5/16"
13'–8 13/
16"
7 1/2" 5'–9 1/2" 2'–3 5/16"
NA NA
40 7'–1/2" 26'–6" 5'–8 3/4" 3'–6" 16'–4 3/8" 7 1/2" 5'–9 1/2"
2'–5 15/
16"
NA NA
50, 55 7'–1/2"
29'–1 15/
16"
5'–8 3/4"
3'–6"
16'–4 5/
16"
7 1/2" 5'–9 1/2"
2'–5 15/
16"
NA NA
60 9'–2" 26'–6"
7'–10 1/4"
3'–6"
16'–4 3/8" 1'–1 1/16" 6'–11 7/8"
2'–5 15/
16"
NA NA
75 9'–2" 26'–6" 7'–10 1/4" 3'–6" 16'–4 3/8" 1'–1 1/16" 6'–11 7/8"
2'–5 15/
16"
NA NA
SEHC
20, 25,
30
7'–1/2" 23'–7 3/8" 5'–8 3/4" 2'–5 5/16"
16'–0 7/
16"
1'–2 5/16" 5'–7 3/8" 2'–3 5/16" 15'–7/16" 16'–4 7/8"
SFHC 40
7'–1/2" 29'–8 1/2" 5'–8 3/4"
3'–6"
19'–6 7/8" 1'–2 5/16" 5'–7 3/8"
2'–5 15/
16"
18'–6 13/
16"
20'–1 7/8"
19'–8 7/8"
SLHC
SSHC
50, 55 7'–1/2" 32'–4 1/2" 5'–8 3/4"
3'–6"
19'–6 13/
16"
1'–2 5/16" 5'–7 3/8"
2'–5 15/
16"
18'–6 13/
16"
20'–1 7/8"
19'–8 7/8"
SXHC
60 9'–2" 29'–8 1/2" 7'–10 1/4" 3'–6" 19'–6 7/8" 1'–2 5/16" 7'–8 7/8"
2'–5 15/
16"
18'–6 13/
16"
20'–1 7/8"
19'–8 7/8"
75 9'–2"
29'–8 1/2" 7'–10 1/4"
3'–6"
19'–6 7/8" 1'–2 5/16" 7'–8 7/8"
2'–5 15/
16"
18'–6 13/
16"
20'–1 7/8"
19'–8 7/8"
Note: The return opening of the roof curb is provided with an adjustable filler panel 6" wide. This panel allows adjustment of the return air opening in
order to clear roof members of all standard roof constructions with both supply and return openings. The return air opening of the curb is at a 90
degree angle as compared to the rooftop return air opening to allow this placement flexibility. The curb acts as a plenum between the ductwork
and the unit return opening. A retainer clip is used to secure the adjustable filler piece to the roof curb.
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