RGM Form 421, Mfg No. 150492, Page 3
3. Dimensions

Figure 1

Dimensions (i nches)
Size A B C D E F G H J K L M
Nat Pro
75, 100 34-3/8 14-1/ 4 35-11/16 14-5/8 4-3/8 3-15/1 6 1/2 1/2 5/ 8 12-1/2 7-1/4 7-7/16 4-5/ 8
125, 140 34-3/8 17 35-11/16 17-3/8 4-3/8 3-15/ 16 1/2 1/2 5/ 8 15- 1/4 7-1/4 7-7/16 6
170 34-3/8 19-3/4 35-11/16 20-1/8 4-3/8 3-15/16 1/ 2 1/2 5/8 18 7-1/4 7-7/16 7-3/8
200 34-3/8 22-1/2 35 -11/16 22-7/8 4-3/8 3-15/16 1/ 2 1/2 5/ 8 20 -3/4 7-1/ 4 7-7/16 8-3/ 4
225 34-3/8 25-1/4 35 -11/16 25-5/8 4-3/8 4-15/16 1/ 2 1/2 1-3/ 8 23-1/2 7-1/4 7-7/ 16 10-1/8
250 34-3/8 28 35-11/16 28-3/8 7-1/8 4-15/ 16 1/2 1/2 1-3/ 8 26-1/ 4 7-1/4 7-7/16 11 -1/2
300 34-3/8 33-1/2 38-1/8 33-7/8 9-7/8 5-15/16 3/4 1/2 1-3/ 8 31-3/4 9-9/16 7-5/8 13-7/8
350 34-3/8 39 38-1/8 39-3/8 12-5/8 5-15/16 3/4 1/2 1-3/8 37-1/4 9-9/16 7-5/8 16-5/8
400 34-3/8 44-1/2 38-1/8 44-7/8 15-3/8 5-15/16 3/4 1/2 1-3/8 42-3/4 9-9/16 7-5/8 19-3/8
Dimensions (mm)
Size A B C D E F G H J K L M
Nat Pro
75, 100 873 362 906 371 111 100 13 13 16 318 184 189 117
125, 140 873 432 906 441 11 1 100 13 13 16 387 184 189 152
170 873 502 906 511 111 100 13 13 16 45 7 184 189 187
200 873 572 906 581 111 100 13 13 16 52 7 184 189 222
225 873 641 906 651 111 125 13 13 35 59 7 184 189 257
250 873 711 906 721 181 125 13 13 35 66 7 184 189 292
300 873 851 968 860 251 151 19 13 35 80 6 243 194 352
350 873 991 968 1000 321 151 19 13 35 946 243 194 422
400 873 1130 968 1140 391 15 1 19 13 35 1086 243 194 492

D

(centerline of hangers)

M

J

(Duct width)
Combustion
Air Opening
4" (102mm)
Minimum unit
spacing
Limit

A

8-1/8"
(206mm)
18"
(457mm)
3/4" (19mm) 3/4" (19mm)
6-3/4"
(171mm)

Front View Side View Rear View

5"
(127mm) 16"
(406mm) KL

C

F

Airflow Keep
clear for
service
29"
(737mm)
3-1/2"
(89mm)
View
port
(both
sides)

E

BG = Gas
Connection
(not supply line)
Combustion
Air Opening
Electric Supply

H

26"
(660mm)