12”x25′ Insulated Ducting

The 12″×25′ Insulated Ducting is a 12-inch diameter, 25-foot flexible duct section built for grow room ventilation runs where temperature control matters. Thick, layered insulation reduces heat transfer between the duct and surrounding air, helping growers maintain consistent canopy temperatures without working the climate system harder than necessary.

12″×25′ Insulated Ducting Specifications

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Why Choose This Insulated Ducting

Standard uninsulated ducting moves air efficiently but does nothing to prevent the duct surface itself from gaining or losing heat along its run. In a sealed grow room or an exhaust path that passes through an unconditioned space, that heat exchange adds load to your climate equipment and can create temperature variation across the canopy. Insulated ducting addresses this directly.

• Temperature-rated construction: The duct maintains its shape and structural integrity at temperatures up to 140°F, so it holds up near HID fixtures or in warm equipment rooms without collapsing or deforming.
• Thick layered insulation: Multiple insulating layers wrap the flexible inner duct, slowing heat transfer between the airstream and the room air around the duct run.
• Full 25-foot section: Each section ships as a complete 25-foot run, long enough to cover most single-room exhaust or intake paths without splicing.
• Consistent quality with standard ducting: Built to the same reliability standard as the non-insulated air ducting line, so growers already familiar with that product can step up to the insulated version without compatibility concerns.

Best Uses for 12″×25′ Insulated Ducting

The 12-inch diameter and 25-foot length make this ducting a practical choice for mid-to-large grow room setups where a single room exhaust or intake run needs full-length insulation coverage. Common use scenarios include:

• Carbon filter exhaust runs: Connecting a 12-inch carbon filter to an inline fan and then routing exhaust out through a wall or ceiling where the duct passes through an unconditioned attic or crawl space.
• High-wattage lighting environments: Rooms running double-ended HPS or large LED arrays produce significant radiant heat. Insulated ducting on the air-cooled hood exhaust helps prevent the duct from re-radiating heat back into the canopy zone.
• Climate-sensitive propagation or flowering rooms: Where even modest temperature swings affect plant development, insulated ducting on intake and exhaust paths reduces the chance of cold or warm spots near duct terminations.
• Ducting runs through warm mechanical rooms: When exhaust ducting passes through a boiler room, equipment room, or similar space, insulation prevents the warm ambient air from heating the exhaust stream and reducing fan efficiency.
• Paired with pre-filter intake assemblies: Using insulated ducting on the intake side of a filtered air system helps maintain consistent incoming air temperature before it reaches fans or climate equipment.

Compatibility

This ducting is sized for 12-inch connections. Before purchasing, verify that your inline fan, carbon filter, and any duct connectors or flanges are rated for 12-inch diameter duct. The 25-foot section length is fixed; if your run requires more length, connect multiple sections using standard 12-inch duct collars or clamps.

The 140°F maximum temperature rating is sufficient for most grow room applications, including air-cooled lighting hoods and standard inline fan exhaust. It is not rated for direct-contact with open-flame or radiant heating surfaces.

If you are also managing airflow with an oscillating circulation fan inside the grow space, note that insulated ducting handles the supply and exhaust runs — internal circulation is a separate function handled by in-room fans.

Usage Guidelines

Flexible insulated ducting performs best when installed with gradual bends rather than sharp kinks. Each tight kink in the run reduces airflow by increasing resistance, effectively reducing the rated CFM of your inline fan. Where possible, support the duct every 4–6 feet with duct hangers or strapping to prevent sag, which also reduces restriction.

When cutting the duct to length, use a utility knife or tin snips to trim the inner core and outer insulation wrap cleanly. Seal any cut ends with foil HVAC tape to prevent insulation fibers from entering the airstream. At connection points, use appropriate clamps or duct tape rated for the operating temperature range to ensure an airtight seal and prevent conditioned air from escaping before it reaches its destination.

For exhaust runs that terminate outdoors, consider a weather cap to prevent back-drafting when fans are off. Regularly inspect the outer insulation wrap for tears or compression damage, particularly at support points, to maintain thermal performance over time.

Sources & Further Reading