Roof-Mount Ventilator Bases

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24 Products

Mounting Bases for Wind-Driven Roof-Mount Exhaust Fans

Flat Base

Straight Base

Slope Base

All bases have a square bottom, round top, and flashing to simplify installation.

To Order: For slope bases, please specify pitch: 1/12-11/12 in increments of 1/12. To determine pitch, use an angle indicator or divide rise by run (see illustration). For instance, if your roof rises 5" in 12" of horizontal space, your pitch is 5/12.

For technical drawings and 3-D models, click on a part number.

Flat Bases

Galvanized Steel
Outlet Dia.	Base Wd.	Ht.	Flashing Wd.	Bottom Shape		Each
8"	10"	10"	4"	Square	0000000	000000
10"	12"	10"	4"	Square	0000000	00000
12"	14"	10"	4"	Square	0000000	00000
14"	16"	10"	4"	Square	0000000	00000
16"	18"	10"	4"	Square	0000000	000000
18"	22"	10"	4"	Square	0000000	000000
20"	24"	10"	4"	Square	0000000	000000
24"	30"	12"	4"	Square	0000000	000000

Straight Bases

Galvanized Steel
Outlet Dia.	Base Wd.	Ht.	Flashing Wd.	Bottom Shape		Each
8"	10"	10"	4"	Square	0000000	000000
10"	12"	10"	4"	Square	0000000	00000
12"	14"	10"	4"	Square	0000000	00000
14"	16"	10"	4"	Square	0000000	000000
16"	18"	10"	4"	Square	0000000	000000
18"	22"	10"	4"	Square	0000000	000000
20"	24"	10"	4"	Square	0000000	000000
24"	30"	12"	4"	Square	0000000	000000

Slope Bases

Galvanized Steel
Outlet Dia.	Base Wd.	Ht.	Flashing Wd.	Bottom Shape	Choose a Roof Pitch		Each
8"	10"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	0000000
10"	12"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000
12"	14"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000
14"	16"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000
16"	18"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000
18"	22"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000
20"	24"	10"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000
24"	30"	12"	4"	Square	1/12, 2/12, 3/12, 4/12, 5/12, 6/12, 7/12, 8/12, 9/12, 10/12, 11/12	0000000	000000