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Aluminium roof vent cap with damper and screen, model 109R

Lambro Ind.

Lambro Ind. 109R 4-In. Aluminum Roof Cap

SKU CH-8F3B-GDDPD

A 4-inch aluminum roof vent cap with a damper and bird screen to block outside elements

  • Damper blocks outside elements from entering vent
  • Screen keeps birds from nesting inside vent
  • Design helps prevent leaks when installed correctly
  • Not intended for clothes dryer venting applications
  • Manufactured in the United States of America

Lambro 109R Aluminium Roof Vent Cap

The Lambro 109R is a four-inch aluminium roof cap designed to terminate ductwork through a roof deck. It serves residential and light-commercial ventilation systems that require a weather-resistant exhaust or intake point.

Built-In Damper and Bird Screen

An integrated damper opens under airflow pressure and closes when the system stops, limiting rain, snow and cold-air intrusion. A fixed screen blocks birds and debris from entering the duct without adding moving parts that could seize over time.

Simple Flashing Mount with One Restriction

The unit mounts directly over a cut roof opening and seals with standard flashing techniques used for plumbing or HVAC penetrations. Installers must note that the manufacturer states this cap is not recommended for clothes dryer venting applications.

How it compares

Measured against everything we stock in Tech Gadgets & Accessories, at today’s prices. Recalculated every night.

Price $30.99
Pricier than about 61% of the 5,998 comparable items (median $24.99).

Specifications

No published specifications for this item yet.

Questions about this item

Does the 109R roof cap run on electricity or generate any noise or heat during all-day operation?

The 109R is a passive aluminum vent cap with a gravity damper and bird screen. It has no motor, fan or electrical components, so it produces no noise, heat or power draw.

What existing roof penetration or duct size must I already have for the 109R to fit and work?

The 109R is built for a 4-inch round duct opening. You need a matching 4-inch hole through the roof deck and a straight 4-inch duct run to connect it.

Will the 109R damper and screen work reliably with older metal or flexible ducting I may keep in place?

Yes. The damper and screen are mechanical only. They function with any 4-inch duct material — rigid metal, semi-rigid or flexible — as long as the duct is secured and sealed to the cap flange.

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