SQ to RND 450² to 300Ø Adaptor

Premium Square to Round Adaptor

Not Your Average Square to Round

This is not your standard plastic adaptor. Designed for both professional installers and quality-focused homeowners, this is a purpose-built solution for connecting square eggcrate grilles to round ducting—without compromise.

Designed for Performance and Durability

Manufactured by The HVAC Shop, this adaptor features a 100mm deep steel frame that provides strength and rigidity where plastic alternatives fall short. No flexing, no warping—just a solid, reliable fit that holds its shape over time.

The integrated metal spigot ensures a secure connection to both flexible and rigid ducting, making installation straightforward and dependable.

Designed for Better Systems

At its core is an R1.0 Kingspan insulated board, helping reduce thermal loss and improve overall system efficiency. It’s a smarter solution for anyone wanting better long-term performance from their ventilation system.

Why Choose This Adaptor?

• Steel construction – strong, stable, and built to last
• No movement or distortion – unlike plastic alternatives
• Insulated backing (R1.0 Kingspan) – improves efficiency
• Secure duct connection – suits flexible and rigid ducting
• Clean, professional finish behind the grille

For Contractors & Homeowners

For contractors, it means a smoother install and fewer issues down the line.
For homeowners, it means a higher-quality system that performs better and lasts longer.

The Bottom Line

This adaptor is higher priced than plastic, but it delivers where it matters—strength, performance, and reliability. It’s the right choice when you want to install it once and know it’s done properly.