The GAF Master Flow Zinc Moss & Mildew Prevention Mill 2.67" x 50' is a roof vent for jobs that require GAF model/MPN NMM50 in the EA sell unit. EPA-approved Zinc Moss & Mildew Preventer installs easily near the roof ridge to help protect your roof against moss and mildew growth.

Key Specs

• Brand: GAF
• Model / MPN: NMM50
• SKU: GAF2550ZR
• Sell unit: EA
• Product type: Roof Vent
• Size / color: 2.67" x 50'
• Category: Roofing Accessories

Key Features

• Helps protect your roof against moss and mildew growth
• Installs easily near the roof ridge for reliable protection
• For asphalt shingle, wood shake, or tile roofs

Coverage & How Much You Need

Coverage or yield is not specified in the available product details. Use the manufacturer installation instructions and project takeoff before converting the job size into order quantity.

Compatibility / Fitment

Use this item only when the brand, model/MPN, size/color, sell unit, and system type match the project specification. Do not substitute it for a different roof vent, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

GAF Master Flow Zinc Moss & Mildew Prevention Mill 2.67" x 50', sold as EA, with SKU GAF2550ZR and manufacturer model/MPN NMM50.

What model or part number should I match?

Match model/MPN NMM50 and confirm the brand is GAF. If the job spec lists a different model, size, color, or system family, hold for review.

What unit is the price based on?

This listing is built around the EA sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Coverage or yield is not specified in the available product details. Use the project takeoff and manufacturer instructions before estimating quantity.

What should be checked before purchase?

Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.

Roofing and exterior-envelope work can involve fall hazards, weather exposure, fumes, adhesives, and system-specific installation requirements; follow the manufacturer instructions, OSHA-safe work practices, and local code or use a qualified contractor.

Product Expert Notes

Choose this item when GAF model/MPN NMM50, SKU GAF2550ZR, and the EA sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.