Black Combi Ducting

Dual-layer ducting that keeps heat, humidity and light in check

Black Combi Ducting from G.A.S is a tough dual-layer ventilation duct that forms the backbone of any grow tent or grow room extraction system, moving stale air out and drawing fresh air in to hold temperatures steady and keep CO2 topped up through veg and flower. It combines an aluminium inner layer with a black polyester outer skin for far greater tear resistance than standard aluminium ducting, and the black exterior blocks light leaks that would otherwise disrupt the dark cycle during bloom. A reinforced spiral wire holds the duct fully open so airflow stays consistent along its length.

Key Benefits

• Dual-layer construction - aluminium inner and polyester outer for real durability
• Light-proof outer layer - protects the dark cycle during flowering
• Reinforced spiral wire - keeps the duct open for consistent airflow
• Tear resistant - far tougher than single-layer aluminium ducting
• Helps cut noise - dampens vibration and rush from the ventilation system
• Wide compatibility - fits most inline fans, carbon filters and duct clips

Heat build-up and humidity from poor ventilation?

Weak ventilation is one of the most common causes of stalled indoor growth. Without enough airflow, heat collects inside a tent and slows vegetative growth, while excess humidity in flower invites mould, poor bud density and lost yield. Black Combi Ducting keeps air moving efficiently to pull out hot, humid air and bring in fresh CO2-rich air, while the light-proof skin guards the dark period during bloom.

How to Use

1. Measure the run between your extraction fan, carbon filter and exhaust point.
2. Cut to length with scissors or a utility knife.
3. Slide the duct over the fan or filter flange.
4. Secure with duct clips or strong tape for an airtight seal.
5. Route through your tent ports or grow room ventilation openings.
6. Avoid sharp bends to keep airflow at its best.