Having already produced a class-leading Passive Ventilation system the question was asked: “Can a specialised unit be produced to provide high performance heat-recovery ventilation for classrooms?” The challenge was to produce a unit to fit within the typical restraints of a ‘tight’ false-ceiling while supplying and exhausting a minimum of 260l/s at an acceptable sound level to satisfy BB93 and with a target SFP of ≤ 0.9W/l/s. This is 45% less energy use than the current maximum SFP allowable of 1.6W/l/s (Government directive 2013) and therefore helps with achieving building compliance.

A further objective was to enable the unit to be turned-down by, at least, 50% air volume without the risk of the heat exchanger going into a laminar-flow condition where no heat-transfer would take place.

Enter the ‘Classmaster’®. With a casing height of only 300mm, Classmaster delivers the required airflow for a typical classroom with the ability to be turned down in 25% steps plus a summer bypass ‘boost’ setting of up to 300l/s to combat over-heating. Fully compliant with BB93 & 101 , with a ‘trickle’ & ‘duty’ speed SFP of 0.88W/l/s, (0.44 per fan), and being fitted with G4, very low maintenance filters, Classmaster can operate via time clock or BMS signal, CO₂ sensor, temperature sensor and PIR with frost protection, automatic summer bypass, night cooling and manual override all being standard options in the ‘Eco-Pro’© control system.

The very low energy EC motors fitted are rated for 100,000 hours operation and the filter maintenance period, under normal operating conditions is up to 18 months.

www.eco-acoustics.co.uk