Axial Fans

Axial fans for 230 V and 400 V from S&P and InoxAir: wall-mounted axial fans with wall plate, tubular axial fans with flanged casing, high-pressure axial fans with two contra-rotating impellers and explosion-proof versions. Depending on the series, the sizes range from 200 to 800 mm impeller diameter.

Types of axial fans

Wall-mounted axial fans

Wall fans sit on a sheet steel wall plate with an integrated inlet nozzle and a protective guard and are installed in a wall opening. These include the S&P series HXTR and HXBR, HCFT H and HCFB H as well as the two-pole types HCGT/2-315/L and HCGT/2-355/I. For wall installation with a guard there is also the TREB SG series.

Tubular axial fans

Tubular fans have a sheet steel tube casing with connecting flanges on both sides and are fitted directly into the duct. The range includes the S&P series TCBT H (400 V, DN 250 to 800), TCBT L, TCBB H (230 V, DN 250 to 560) and TCBB L as well as the EC series TXBR ECOWATT. In the high-pressure versions TCBTx2 and TCBBx2 two contra-rotating impellers work in series.

Explosion-proof axial fans

For potentially explosive areas there are the series TCBT H Ex, TCBT Ex and HCBT H-EX. According to the S&P type code, the suffix EX stands for ATEX approval.

Axial fan with 400 V or 230 V?

For the S&P series pairs TCBB/TCBT, HCFB/HCFT and HXBR/HXTR, the B version is for single-phase 1~ 230 V and the T version for three-phase 3~ 400 V. A 400 V axial fan requires a three-phase supply and is mainly used in commercial and industrial applications. Examples with 400 V are S&P HXTR/4 in sizes 250 to 630 with 770 to 13,720 m³/h free-blowing according to S&P, and TCBT/4-800/G and TCBT/4-800/K with an 800 mm impeller. For homes and smaller businesses with a 230 V supply, the B versions or the InoxAir axial fan are suitable.

Reading the type code and choosing correctly

With S&P, the number after the slash is the number of motor poles (2 = approx. 2,700, 4 = approx. 1,400, 6 = approx. 900 revolutions per minute), followed by the impeller diameter in mm. The letter at the end, such as H, L, G or K, indicates the blade angle. The required air flow and the pressure loss of the system are decisive for the selection: axial fans move large air volumes at rather low back pressure; with long ducts or filters a centrifugal fan is often more suitable. Read more in the guides types of fans at a glance and choosing a centrifugal fan. Matching S&P DEF guards are available for tubular axial fans.

Frequently asked questions about axial fans

What is the difference between an axial and a centrifugal fan?

In an axial fan the air flows through the impeller parallel to the axis. It moves large air volumes at low to medium pressure. Centrifugal fans deflect the air by 90 degrees and achieve higher pressures.

What does the size of S&P axial fans mean?

The size corresponds to the impeller diameter in mm. A TCBT/4-800 therefore has a 4-pole motor and an impeller with a diameter of 800 mm.

Do I need a qualified electrician for a 400 V axial fan?

Yes, connection to a three-phase 3~ 400 V supply and motor protection should be carried out by a qualified electrician. The connection details are given in the operating instructions of the respective fan.