Wall Vent Cap for 3-2/4 in x 10 in Duct - Tight Seal Vent Hood

In this review of the Wall Vent Cap for Microwave, Range Exhaust and Bath Ventilation fan, the bottom line is simple: this is a no-nonsense vent hood for installers who need a compact, sturdy exterior termination that seals well when idle. The reviewer found it ideal for retrofit work where the duct is 3-2/4 in by 10 in and space is limited; its most important benefit is the spring loaded flapper that provides a tight seal to keep nests and small animals out. It is not flashy, but it performs the specific job of an exterior vent termination reliably.

Key Features

• Compact overall size: The 3.5 in wide by 5-5/8 in high face fits tight wall cutouts and keeps the exterior profile small.
• Spring loaded flapper: The flapper closes automatically to form a tight seal when the vent is not in use, helping prevent drafts and animal entry.
• Sturdy construction: Well made materials and a robust build give the cap durability for exterior exposure and regular use.
• Duct engagement depth: The duct fitting protrudes 4-7/8 in from the back, making it easy to insert and secure standard rectangular ducting.
• Multipurpose fit: Designed for microwave range exhausts, commercial range hoods and bath ventilation fans that use the specified duct size.

Who It's For

This wall vent cap is best for homeowners, contractors and remodelers who need a compact, reliable exterior termination for a 3-2/4 in by 10 in duct, especially when preventing pests and drafts is a priority. It suits installations behind microwaves, smaller commercial range hoods and bathroom fans where exterior clearance is limited.

DIYers looking for decorative finishes or integrated insect screens may want to look elsewhere, or plan to add a separate screen, since several users noted issues with the supplied screen quality and attachment. For larger ducts or fashionable architectural faces, choose a model sized and styled for those needs.

Pros & Cons

Pros

• Solid build quality gives confidence in long-term exterior use and resistance to wear.
• The spring loaded flapper provides an effective seal to keep out nests and small animals when idle.
• Compact face dimensions make it suitable for tight wall openings and retrofit jobs.
• Duct fitting depth simplifies connection to standard rectangular duct runs.

Cons

• The included screen has received negative feedback for attachment and may require reinforcement or replacement.
• Limited aesthetics: the plain white finish is functional but not decorative for visible facade applications.

Specifications

Product type	Wall vent cap for 3-2/4 in x 10 in duct
Overall face size	3.5 in wide x 5-5/8 in high
Duct fitting projection	4-7/8 in from back
Primary use	Microwave range exhaust, range hoods, bath ventilation fan
Closure	Spring loaded flapper for tight seal
Finish	White

Our Verdict

The Wall Vent Cap is a practical, well built exterior termination that excels when a secure, compact seal is required for a 3-2/4 in by 10 in duct. Installers and homeowners who prioritize function and pest prevention will find it good value, though those wanting a decorative face or a more robust screen may need to upgrade those elements separately.

Frequently Asked Questions

Will this fit a standard rectangular 3-2/4 in x 10 in duct?
Yes, the cap is specified for that duct size and the duct fitting protrudes 4-7/8 in to allow easy insertion and connection.

Does the flapper keep animals and nests out?
The spring loaded flapper provides a tight seal when not in use and is effective at deterring nests and small animals, though users should inspect the screen attachment.

Is the included screen durable?
Some customers reported the screen quality or attachment is weak, so reinforcement or replacement may be necessary for long-term security.