Shropshire-based fabricator, Universal Trade Frames (UTF), has strengthened its Spectus Vertical Sliding (VS) window offer, achieving an A+ Window Energy Rating (WER) as standard.

Following independent re-testing and validation, the upgraded specification delivers a U-value of 1.4 on VS windows (1.3 on casement), using UTF’s standard glass and reinforcement setup, with no need for complex glass upgrades or niche configurations to hit A+.

UTF achieves this with RCM reinforcing welded into the profile, creating extra chambers that aren’t present in ‘bare’ extrusions or steel‑reinforced alternatives. This construction improves thermal performance, screw retention and overall robustness while staying within a familiar Spectus VS platform. Standard specification includes low‑iron, Low‑E, warm edge glazing to balance U‑value and solar gain, supporting strong WER performance.

“Our A+ WER rated VS puts theory into practice with boosted energy efficiency that brings real-life benefits to end-users by improving comfort and lowering energy bills,” said Richard Hammond, Sales Director at Universal Trade Frames.

“While many of our competitors essentially sell the same base system as us, they don’t offer UTF’s tested and verified A+ configuration and reinforcement. This means installers currently buying the Spectus VS elsewhere can instantly upgrade WER and performance by switching to UTF, without the hassle and expense of changing profile.”

UTF’s offering is particularly helpful to installers looking to win higher‑value heritage and VS projects where performance and compliance are increasingly scrutinised by energy-conscious planners and homeowners.

Part of UTF’s wider ‘Difference is Universal’ approach, built on continuous improvement, consistent quality and repeatability at scale, this latest VS upgrade offers practical gains that increase end-user satisfaction, reduce callbacks and help installers deliver higher-value projects with confidence.

Summing up, Richard said: “In a nutshell, our A+ WER VS offer translates to a clear, sellable advantage for installers and fabricators who want to offer their customers better performance – and that’s what makes it really stand out.”