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Sample Ventmann PLine – 2 Slot Diffuser - (19.5 cm)
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Frameless Ventilation Valves: The Complete UK Guide (Round, Square & Linear)
A frameless ventilation valve has no visible rim: the body is plastered into the ceiling and the face finishes flush. Sizes, airflow rates, Part F duties and how to install one.
Free HVAC Tools & Engineering Resources: 8 Calculators Worth Bookmarking
Eight free, browser-based HVAC tools worth bookmarking — cooling load, Part F ventilation and duct sizing calculators, refrigerant pre-charge, silencer selection, psychrometrics and more. No login needed.
Acoustic Box vs Thermo Box: Which Plenum Does Your Slot Diffuser Need?
Acoustic Box (GTG) or Thermo Box (VTBOX)? How Ventmann’s two plenum boxes differ — top entry vs side entry, noise reduction vs insulation — and which one your linear slot diffuser needs.