Stadium BM725 127mm core drill ventilator, packed with a Black Hole cavity liner, is what sets it apart from the standard BM418 core drill ventilator. The Black Hole design changes the direction of the airflow through the tube, slowing down the air that's coming in so you don't get a draught - and blocks out any light passing through to stop insects and vermin sneaking in. It has a 30cm² free area and comes in at 5-13kW net rated input. The adjustable tube length is between 228-585mm - meaning you can get it to fit most wall thicknesses without needing to add extra bits. The grille inside is white, and the bit on the outside is brown.
The Black Hole liner really is what makes the BM725 different from the BM418. The BM418 has a plain old straight tube, whereas the BM725 has a liner that messes about with the airflow, making it change direction a few times - which helps slow down the air and makes the draughts disappear before they even get into the room, making it a lot more comfortable to have the background ventilation. This liner also blocks out the light, which is a big plus if you can't have a clear line of sight through the wall - you know, for places where you don't want people looking in. You don't need any separate extension tubes because they've got adjustable tube that covers most wall and cavity thicknesses.
Of course, the 30cm² free area and 5-13kW rated input means this ventilator isn't going to be big enough for full 27kW combustion air supply that the BM418 does, but that's not what it's designed for. You should check your appliance's ventilation requirements before you pick this one.
Key Features & Benefits
Black Hole Cavity Liner - Slows down the air coming in by changing its direction through the tube - stops draughts from being a problem.
Light-Blocking - This bit stops any light from getting through the vent - keeps the unwanted critters out.
30cm² Free Area - 5-13kW Net Rated Input - for use with smaller gas appliances or just general background ventilation.
One Adjustable Tube Length - 228mm to 585mm - so you can get it to fit most of the wall thicknesses without needing any extra bits.
Fixed Anti-Draught Baffles - built right in, they keep those draughts at bay.
White Inside, Brown Outside - 180 × 155mm cowl and 155 × 155mm grille. Tube is 127mm in diameter.
BM418 vs BM725 — What Do I Need?
BM418 - 100cm² (70cm² with baffle), 27kW net rated. A straight tube with an optional baffle, if you want it. For when you need full combustion air for up to 27kW.
BM725 (this one) - 30cm², 5-13kW net rated. Black Hole liner - does a fantastic job of blocking out the light and cutting down on draughts. Use it for lower-rated appliances or if you just want some background ventilation where being draught-free is top priority.
Who's It Ideal For?
Smaller gas appliances that top out at 13kW
Anybody who wants a bit of background ventilation that won't make a draught
Places where you can't have any light passing through the vent and don't want critters sneaking in
Walls with varying thickness - our adjustable tube will cover it, no need for extra bits
Black Hole ventilator, best for maximum draught and light control on smaller appliances up to 13kW, with an adjustable tube length of 228-585mm. Get yours now. Also available: BM418 from Stadium for those appliances that need up to 27kW and all that extra space.
Specification
Stadium BM725 127mm Core Drill Black Hole® Ventilator Specification
Manufacturer
Stadium
Model
BM725
Product Type
127mm Core Drill Black Hole® Ventilator
Tube Diameter
127mm (5")
Tube Length (adjustable)
228mm – 585mm
Free Area
30 cm²
Rated Input
5–13 kW net
Cavity Liner
Black Hole® – anti-draught, light-blocking
External Cowl Dimensions
180 × 155mm
Internal Grille Dimensions
155 × 155mm
Internal Finish
White
External Finish
Brown
Features
Stadium BM725 127mm Core Drill Black Hole® Ventilator Features
Black Hole® Cavity Liner - Changes airflow direction through the tube to slow incoming air velocity - significantly reduces draughts compared to a straight-tube ventilator.
Light-Blocking — Prevents light passing through the vent - deters insects and vermin from following light into the building.
30cm² Free Area - 5–13kW Net Rated Input - For smaller gas appliances and background ventilation requirements.
Adjustable Tube - 228mm to 585mm - Single tube covers most wall thicknesses without extension tubes required.
Fixed Anti-Draught Baffles - Integrated within the Black Hole liner for constant draught reduction.
White Internal Grille / Brown External Cowl - 180 × 155mm cowl, 155 × 155mm grille. 127mm tube diameter.
Questions
Reviews
Stadium BM725 127mm Core Drill Black Hole® Ventilator Reviews
