4BAOHUI Vents 02 Felt Lap Vents, Pack of 22

4BAOHUI Vents 02 felt lap vents are supplied as a pack of 22 for adding airflow beneath roof felt. The listing claims 3000mm² of free airflow per vent and compatibility with joist centres from 400mm to 600mm.

At a glance

The listing describes an arched design with multiple holes and says each vent provides 3000mm² of free airflow.
The vents are pushed between felt joins, according to the listing.
Spring clips are described as helping to hold the vents in place during installation.

Price

£25.49Save 15%

Reference price: ~~£29.99~~

Price checked: 12 Nov 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

22 x Felt Lap Vents, Loft Vents for Condensation, Roof Ventilation Lap Vents, Felt Lap Vents Prevents Loft Roof Condensation,

£27.99

Pros and cons

Pros

A 22-piece pack gives multiple vents for a roof ventilation project.
The specified 400mm to 600mm joist-centre range covers several common spacing configurations, as claimed in the listing.
The push-between-felt-joins fitting method may suit buyers looking for a straightforward installation approach.

Technical specifications

7 specifications

Identity
Brand	4BAO

Dimensions and installation
Dimensions listed	30 x 20 x 2 cm; 1.52 kg
Weight listed	1.52 kg
Pack quantity	Pack of 22 Lap vents
Individual vent dimensions	length 203mm, width 280mm, height 19mm
Free airflow per vent	3000mm²
Joist centre range	400mm to 600mm

What to know before buying

Listing details to confirm

The listing details are inconsistent: the supplied pack description gives 203mm length, 280mm width and 19mm height, while the product-dimensions field states 30 x 20 x 2 cm; 1.52 kg, and the weight field also lists 1.52 kg. Confirm the dimensions and whether that weight applies to one unit or the pack before planning installation. The condensation-reduction statements are manufacturer claims, not guaranteed outcomes.

Who is it for?

A good fit for

Buyers seeking multiple felt lap vents for a loft roof with joist centres between 400mm and 600mm.
DIYers looking for vents that the listing says push between felt joins.

Less suited to

Buyers who need verified dimensions or a confirmed per-vent versus pack weight before purchasing.

4BAOHUI Vents 02 Felt Lap Vents, Pack of 22 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 460 ratings

5 stars71%71%
4 stars18%18%
3 stars7%7%
2 stars2%2%
1 star2%2%

Customer feedback highlights ease of fitting and use, perceived quality, and reports of reduced loft condensation or dampness. These experiences are relevant to buyers seeking additional airflow, but the reported results are individual customer perceptions and do not guarantee that ventilation alone will resolve a moisture problem.

Positive themes

Customers report that the vents are easy to fit and simple to use.
Customers describe the vents as good quality and report reduced loft condensation or dampness.

Frequently asked questions

How many vents are included?

The listing describes a pack of 22 lap vents.

How much free airflow does each vent provide?

The listing claims 3000mm² of free airflow per vent.

What joist spacing is supported?

The stated joist-centre range is 400mm to 600mm.

Are the listed dimensions consistent?

No. One entry gives 203mm by 280mm by 19mm, while the product-dimensions field states 30 x 20 x 2 cm. Confirm the dimensions with the selected listing before buying.