Big Book of Hamworthy Products and Services

96 Products that perform | Service that delivers | People that care Best practice heating & hot water plant refurbishment CPD Hamworthy’s CIBSE-accredited CPD looks at the best way to carry out an assessment on the current heating and hot water plant. This course would benefit contractors, consultants, specifiers and facilities managers who will gain an understanding of systems and their application, refurbishment best practice, and how t o identify a reas for improvement in the plantroom. See page 41 fo r more information and how to book. Sizing and conversions These tables show you the plant room ventilation required for open flued appliances. Don’t forget room sealed appliances need ventilation too. Gas conversions Btu ÷ 3412 = kW kW x 3412 = Btu Btu ÷ 1035 = ft 3 /h (nat gas) kW x 3.29 = ft 3 /h (nat gas) ft 3 /h to m 3 /h = divide ft 3 /h by 35.315 Meter size : kW x 0.0929 = m 3 /h (nat gas) 100 kW x 0.0929 = 9.29 m 3 /h (example) kW x 0.0375 = m 3 /h (Propane) kW x 0.0285 = m 3 /h (Butane) m 3 LPG x 2.48 = m 3 Nat Gas m 3 Nat Gas ÷ 2.48 = m 3 LPG 1 litre 35 sec oil x 0.976 = m 3 /h nat gas m 3 /h Nat Gas ÷ 0.976 = litres 35 sec oil Compartment ventilation Open flue direct to outside High level - 5cm 2 /kW nett input Low level - 10cm²/kW nett input Boiler house ventilation Open flue direct to outside High level - 2cm²/kW nett input Low level - 4cm²/kW nett input Guidance notes High and low level grilles should be installed as high and as low as possible Atmospheric input = output x 1.2 Pre-mix non condensing input = output x 1.15 Pre-mix condensing input = output x 1.07 Compartment ventilation room sealed Direct to outside air High level - typically 5cm²/kW nett input Low level - typically 5cm²/kW nett input Compartment ventilation room sealed To room or internal space High level - typically 10cm²/kW nett input Low level - typically 10cm²/kW nett input Boiler house ventilation room sealed Direct to outside air High level - typically 2cm²/kW nett input Low level - typically 2cm²/kW nett input Gas meter conversion table Meter size Nat gas m 3 /hr Nat gas ft 3 /hr Propane m 3 /hr Butane m 3 /hr kW Btu/h x 1000 U2 2.5 88 1.04 0.8 26.9 92 U6 (G4) 6.0 212 2.5 1.91 64.6 220 U10 (G6) 10.0 353 4.16 3.18 107.7 367 U16 (G10) 16.0 565 6.66 5.09 172.3 588 U25 (G16) 25.0 883 10.41 7.96 269.2 919 U40 (G25) 40.0 1,412 16.65 12.72 430.5 1469 U65 (G40) 65.0 2,296 27.06 20.69 700 2388 U100 (G65) 100.0 3,529 41.6 31.8 1076.4 3671 U160 (G100) 160.0 5,649 66.58 50.89 1722.3 5876 Use this chart to cross reference your boiler output to gas meter size. Open flued appliances >70kW nett rated input BS6644 Room sealed appliances

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