The TSS-160-AD is the official 160mm to 150mm reducing adapter for the Verplas Rapid Self-Seal Thermal Ducting system. It provides a neat, airtight transition between the 160mm thermal duct run and a standard 150mm round duct connection — typically at the point where the insulated loft run meets an un-insulated final leg, a ceiling valve, or a fan spigot. Compact and lightweight, it eliminates the need for improvised reducers or taped joints at this critical handover point.
Neopor® EPS
Insulation Material
TSS-160 System
Compatible With
System Interface Fitting: The TSS-160-AD is the correct component for transitioning from the 160mm thermal system to any 150mm duct or spigot — including fan terminals, ceiling valves, and in-line grilles that have a standard 150mm connection.
Direction Matters: The adapter is not thermally symmetric — the 160mm (EPS) end connects to the thermal duct system and the 150mm end connects to standard ductwork or a fan spigot. Ensure it is oriented correctly during installation.
Key Features
160mm to 150mm Reduction
Provides the standard system transition between the Verplas 160mm thermal duct run and the widely used 150mm round duct diameter at fan terminals and ventilation outlets.
Airtight System Interface
The 160mm side is compatible with the Verplas Self-Seal connector system, maintaining system airtightness at the thermal-to-non-thermal handover point.
Insulated Construction
The body incorporates EPS insulation to continue thermal protection through the transition and reduce condensation risk at the adapter joint.
Eliminates Improvised Reducers
Using the correct manufacturer adapter avoids the airtightness failures and condensation risks common with taped, site-made reducers at this transition.
Compact & Lightweight
The adapter is small and light, making it easy to handle in tight ceiling or loft spaces where the thermal run meets the final installation point.
Full System Compatibility
Part of the complete TSS-160 Verplas Thermal Ducting range — designed to work alongside straight lengths, bends, T-pieces, and connectors.
Specifications
| SKU |
TSS-160-AD |
| Inlet Diameter (Thermal Side) |
160 mm |
| Outlet Diameter (Standard Side) |
150 mm |
| Material |
EPS / Polystyrene composite |
| Colour |
Grey |
| Operating Temperature Range |
−15°C to +60°C |
| System Compatibility |
Verplas 160mm Rapid Self-Seal Thermal Ducting |
| Typical Use |
Loft thermal run to 150mm fan spigot or ceiling valve |
| Compliance |
Part of system compliant with UK Building Regulations Part F |
Frequently Asked Questions
When do I need the TSS-160-AD adapter?
You need the adapter wherever a 160mm thermal duct run terminates at a fitting with a 150mm connection — such as a fan with a 150mm spigot, a ceiling extract valve, or a transfer grille with a 150mm collar.
Does the adapter maintain the Self-Seal airtightness?
The 160mm end connects within the Verplas Self-Seal system, maintaining system airtightness at the thermal run. The 150mm outlet should be sealed to the receiving spigot using appropriate duct tape or a push-fit connector as required by the terminal fitting.
Can I use this adapter in reverse to step up from 150mm to 160mm?
Physically the adapter can be reversed, but it is designed to step down from 160mm thermal to 150mm standard. Using it in reverse is not recommended as the connector orientation would not provide the designed airtight seal.
Is this the only adapter available for the 160mm thermal system?
The TSS-160-AD (160mm to 150mm) is the primary reducer for this range. For connections to other sizes or rectangular ducting, consult the wider Verplas range or contact your supplier for guidance.
Can the adapter be used to connect the 160mm thermal system to a fan mounted in a ceiling or wall?
Yes — this is the primary use case. The adapter transitions the thermal insulated run to the 150mm spigot on the fan unit, allowing the thermal duct to be run as close to the fan as possible before the final uninsulated connection.
