Mr. Sigloch, why did ebm-papst develop the RadiCal in scroll housing ?

Special fans that control both air intake and exhaust are needed for resi­den­tial venti­lation in both new and reno­vated build­ings. Until now, fans with forward-curved impellers were used for central home venti­lation units. But the proven RadiCal centrifugal fans with free-running back­ward-curved impellers deliver signif­i­cantly better results for both effi­ciency and noise emis­sion. Now we have combined the proven RadiCal fans with an aero­dy­nam­i­cally opti­mized scroll housing for use in central home venti­lation units, for which the prod­ucts used must be extremely quiet.

Uwe Sigloch, Head of Product & Market Manage­ment at ebm-papst Mulfingen. (Foto | ebm-papst)

What specific bene­fits does RadiCal in scroll housing have for resi­den­tial venti­lation ?

The round outlet of the new scroll housing fits directly onto the ducts that distribute the air, reducing air flow losses in the duct system while also reducing the noise level by up to 3.5 dB(A) when compared to a centrifugal blower. The disturbing blade passing noise of a back­ward-curved impeller in a living envi­ron­ment has been signif­i­cantly reduced through the combi­na­tion with the opti­mized scroll housing. The tonal propor­tion in the disrup­tive frequency range is reduced by up to 20 dB in compar­ison to conven­tional instal­la­tion condi­tions.

And how does the product ensure that the optimum amount of air is always moved ?

A vane anemometer posi­tioned in the outlet of the scroll housing contin­u­ously records the actual air flow and trans­mits the data to the inte­grated central control elec­tronics of the fan. These control elec­tronics adapt the speed of the EC motor to the desired setpoint value, thus regu­lating the air volume. This inte­grated volume constancy control enables effec­tive home venti­lation without an over­pres­sure or under­pres­sure occur­ring in the living space. This prevents humidity in the walls and unwanted cold air supply from outside.