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Master Flow Mill 12-in Galvanized steel Internally braced Roof Turbine Vent

Name: Master Flow Mill 12-in Galvanized steel Internally braced Roof Turbine Vent
Brand: Master Flow
SKU: 5014251481
Price: 92.55 USD
Availability: InStock
Rating: 4.3 (29 reviews)

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4.3

Manufacturer Color/Finish: Mill

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The GAF Master Flow internally braced turbines are efficient, easy-to-install venting options for your roof. They allow heat and moisture-laden air to escape your attic, helping to extend the life of your roof. They are designed with upper and lower steel ball bearing systems for years of trouble-free operation. The adjustable base allows for installation on virtually any roof, from 2:12 pitch up to 12:12 pitch.

Internally braced turbine helps exhaust heat and moisture
Suitable for roof pitch of 2:12 up to 12:12
Durable galvanized construction for smooth and quiet operation
Galvanized construction
Simple, mechanically locked, 2-piece design (Head and base) - allows for faster, easier installation
Base also has extra-large flashing for easier installation and superior weather protection
Permanently lubricated track system of dual bearing system ensures years of trouble-free spinning
Head has heavy-duty steel spider braces for strength and durability
Dual-bearing system with encased design helps to prevent dirt, dust, sand and other foreign materials from damaging the bearing, resulting in a smother spin

General
Color/Finish Family	Silver	Material	Galvanized steel
Type	Internally braced	Series Name	Mill
Manufacturer Color/Finish	Mill

Dimensions
Weight (lbs.)	9	Rough Opening Width (Inches)	12
Height (Inches)	20	Rough Opening Length (Inches)	12
Width (Inches)	19	Length (Inches)	19
Net Free Area (Sq. Inches)	113

Features
Flashing Included	Yes	Adjustable	Yes

Certifications
CA Residents: Prop 65 Warning(s)	No

Warranty
Warranty	Limited lifetime

Miscellaneous
UNSPSC	30151600

Check out the Best Selling Roof Turbine Vents on Lowes.com

Review

4.3 out of 5

29 Reviews

2 Star

76% Recommend this product

Ratings may include incentivized customer reviews.

29 Customer Reviews

Sort By

Turbines appear to be working as described

Bought 3 to release the heat in the attic. Electric bill was becoming a challenge. So far, it appears to be helping with the attic heat issue. Awaiting the next bill to see the results. I have noticed that my A/C is not running as hard or as long as it used to. That's a move in the right direction.

Joe LOctober 1, 2026
From 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

Thanks for the feedback. Happy to hear that you are satisfied with your Master Flow purchase. If you have any other inquiries about our Master Flow p... Read More

Master FlowOctober 1, 2026

MasterFlow

Glad I was able to get Weathered Wood color.

Would Recommend

I’m pleased with my purchase of 2 roof wind turbine vents. But one came with the small black cap loose in the box. When I snap it back in place it pops loose again. I’ll have to add screws to hold it tight. Without it in place rain can come straight into the attic.

FaroJuly 7, 2026
From Weathered Wood 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

Please email, masterflowtech@gaf.com, if you need further assistance. Thank you.

Master FlowJuly 8, 2026

MasterFlow

Works fine

Would Recommend

Liked that it work

EugeniaJanuary 24, 2026
From 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

Thank you for your feedback; we are glad to hear that you are happy with the product.
If you have any further inquiries about our Master Flow pr... Read More

Master FlowJanuary 26, 2026

MasterFlow

Galvanized steel Intern for attic

Would Recommend

LauraDecember 15, 2025
From 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

Happy to hear that you are satisfied with your purchase and thank you for your feedback. If you have any other inquiries about our Master Flow produc... Read More

Master FlowDecember 15, 2025

MasterFlow

again

Would Not Recommend

had to replace old one as bearings were shot

trumpOctober 1, 2025
From 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

We are glad that you are satisfied with our product and thank you for taking the time to post a review. If you have any other inquiries about our Mas... Read More

Master FlowOctober 2, 2025

MasterFlow

Ordered y. Not delivered?

Would Not Recommend

Placed order. Promised delivery. Still waiting for delivery. 940-140 today? Such specific time. But no delivery.

CristopherMarch 22, 2025
From 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

Sorry to hear that the item was not delivered as expected and thank you for your feedback. If you have any other inquiries about our Master Flow prod... Read More

Master FlowMarch 24, 2025

MasterFlow

Ordered online, Sent a broken unit.

Would Not Recommend

It was broken and had to be repaired in order to install

NothappyNovember 22, 2024
From 12-in Galvanized steel Internally braced Roof Turbine Vent Verified Purchaser

Was this Review Helpful ?

Response from Master Flow

Sorry for your experience. If you have any questions regarding our products, please email masterflowtech@gaf.com. Thank you for your feedback and... Read More

Master FlowNovember 26, 2024

MasterFlow

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COMPARE PRODUCTS

		Name	Current Item Master FlowMill 12-in Galvanized steel Internally braced Roof Turbine Vent
		Ratings	29
		Material	Galvanized steel
		Height (Inches)	20
		Width (Inches)	19
Master FlowMill 14-in Aluminum Internally braced Roof Turbine Vent	Air Vent12.0-in Aluminum Internally braced Roof Turbine Vent	Air Vent12.0-in Aluminum Internally braced Roof Turbine Vent	Air Vent12.0-in Aluminum Internally braced Roof Turbine Vent	Master FlowMill 12-in Galvanized steel Externally braced Roof Turbine Vent	Air Vent14.0-in Aluminum Internally braced Roof Turbine Vent	Air Vent12.0-in Aluminum Externally braced Roof Turbine Vent	Master FlowWeathered Wood 12-in Galvanized steel Externally braced Roof Turbine Vent	Master Flow12-in Galvanized steel Externally braced Roof Turbine Vent
2	236	236	236	9	100	236	2	1
Aluminum	Aluminum	Aluminum	Aluminum	Galvanized steel	Aluminum	Aluminum	Galvanized steel	Galvanized steel
19.5	18.7	18.7	18.7	19.5	21.7	19.3	19.5	21
23	20.6	20.6	20.6	19	20.6	20.6	19	19