Technical Documents



Free hand held rotating air duct calculator used for sizing supply and return duct systems using the equal friction design method.

Includes scales for friction loss pa/m of duct, air quantity m³/sec, air velocity, duct diameter mm, and rectangular duct dimensions mm.

A valuable tool for all stages of your HVAC product selection

Click here to see the WAP-U-Lator in action

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The Green Book

Free comprehensive 40-Page guide to understanding, specifying and installing air diffusion grilles, louvres and chilled beams.

This valuable guide, from Waterloo Air Products plc., gives you everything you need to know when selecting your Air Terminal Device (ATD) and system.

This Free and exhaustive ATD selection tool covers…

  • Terms, definitions and symbols
  • Conventional air diffusion patterns
  • ATD Characteristics and selection guide
  • Comfort criteria – thermal, velocity and acoustic jet theory and characteristics
  • Acoustic information – spectrum correction, octave band analysis

All this and much more…
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Chilled Beams cbca

Chilled Beams Guide cbca

Free comprehensive 36-page introduction to understanding, specifying and installing chilled beams and ceilings, published by the Chilled Beams and Ceilings Association, a specialist section of HEVAC / FETA.

This valuable guide gives you everything you need to know when selecting and specifying chilled beams and ceilings.

Authored by experts with a track record of real world air diffusion development, experience and achievement, this guide will help you understand your options.

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BSRIA HVAC Troubleshooting

BSRIA HVAC Troubleshooting

Receive 25% off with Waterloo; simply type in


at the Online Checkout

If you are already a member of BSRIA
you can download the PDF for free.

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