How do you fit them because i'm totally useless at diy?

Hi. The part with the lift up flap goes on the inside of the window frame and the larger grill part goes on the outside of the frame. I drilled a series of holes along the line of where I fitted the vent to provide the airflow using a very sharp new drill.

Do these go on the window or above on the frame?

They can go on either, but the frame is best

1. Should the flap open up or downwards? 2. How often/long should they be open for to stop the condensation/damp please?

Flap hinge should be at the top and the flap open upwards. Mine are left open permanently and effectiveness is dependent on size of room, size of window and the temperature / humidity of the environment.

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Window Trickle Slot Vent 407mm White for uPVC Double Glazing & Timber Windows Reduces Condensation, Damp & Steam in Windows Fully Adjustable

Product ID: 55056361

🏠Compatible with uPVC, timber & aluminium

🌬️3728 mm² airflow capacity

🛠️Easy fit with included screws & end caps

$28.04

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Elevate your space with fresh air and zero damp drama!

ROBUST RELIABLE - Heavy-duty construction built to replace existing vents seamlessly
COMPACT YET POWERFUL - Slim 407mm profile delivering impressive 3728 mm² airflow tested to BS EN standards
BREATHE EASY LIVE BETTER - Reduces condensation, damp & mould for healthier interiors
PRECISION AIRFLOW CONTROL - Fully adjustable vent ensures optimal ventilation tailored to your space
UNIVERSAL FIT EFFORTLESS INSTALL - Designed for uPVC double glazing, timber & aluminium windows & doors

The Window Trickle Slot Vent 407mm White is a fully adjustable, heavy-duty ventilation solution designed for uPVC, timber, and aluminium windows and doors. Measuring 407mm in length, it provides a substantial 3728 mm² airflow area, effectively reducing condensation, damp, and mould. Easy to install with included parts, it meets BS EN 13141-1:2004 airflow standards, ensuring reliable performance and healthier indoor air quality.

Specifications

ASIN	B017NYDCCI
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	34,524 in DIY & Tools ( See Top 100 in DIY & Tools ) 11 in Window Ventilators
Colour	White
Customer Reviews	4.4 4.4 out of 5 stars (2,177)
Date First Available	6 Nov. 2015
Guaranteed software updates until	unknown
Item Package Quantity	1
Item Weight	81.6 g
Item model number	MJ 4000
Manufacturer	Draak
Part Number	MJ 4000
Product Dimensions	40.59 x 3.91 x 1.6 cm; 81.65 g
Size	407mm

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$28.04

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Abdullah B.

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