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CENTRIFUGALS FANS
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DA fans are low pressure centrifugal fans, with double inlet and equipped with a forward curved blade.

The range comprises 15 different sizes available in several versions.
»   DA-NT
11 models from 7/7 to 18/18
 
»   DA-RT
11 models from 7/7 to 18/18
 
»   DA-RTCE
9 models from 7/7 to 30/28
 
»   DA-R3TC
7 models from 9/7 to 18/18
 
»   DA-N2T
11 models from 7/7 to 18/18
 
»   DA-RTC
11 models from 7/7 to 18/18
 
»   DA-R2TC
11 models from 7/7 to 30/28
 
»   DA-R2TCE
13 models from 7/7 to 30/28
 
»   DA-R3TCE
8 models from 7/7 to 30/28
   
DA fans have forward curved centrifugal impellers, tablocked on both sides to two steel rings and to a double disk at the centre.

The blade is designed to minimize the loss caused by air turbulence and to obtain maximum efficiency with minimum sound level.

All impellers are dynamically balanced. The housings, in galvanized steel, are formed by two side plates spot-welded to a central scroll.

A cut-off mounted on to the discharge prevents turbulence.

The side plates have an aerodynamic profile and include some drill holes to allow fixing of the base supports as well as the motor support.

Four positions can be selected for the base support and eight for the motor support.

The ball bearings are mounted on rubber inserts to reduce vubration except for the framed versions which are filled with cast ball bearing housings.

Operating temperature -30°C to + 85°C. The “R” series fans are based on standard “N” fans equipped with rectangular side structures built with “L” profiles which reinforce the unit, forming a rigid cube structure.

This frame is welded to the sides of the fan.

A number of groove-shaped drills on the strenghthening frame corners allow for a proper fixation.
 
 
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The DAP Series of belt-drive fan-deck assemblies are available with either a fan scroll or separate base frame mounted motor configurations. All models include forward curved centrifugal fan impellers, with electro-welded double disc hubs supported on both sides by high quality ball bearing assemblies.
   
Impeller

All impellers have been specifically designed and matched to maximise airflow efficiency and minimise generated noise levels.

All impellers are balanced both statically and dynamically before complete DAP unit assembly.

Fan Scroll

The fan scrolls encasing the centrifugal impellers are manufactured from high grade galvanised sheet steel.

The scrolls consist of two pressed side inlet parts with an electro-welded rolled shell. All scrolls have been designed to minimise turbulence at the outlet by including a specially formed cut-off.

The pressed casing sides also include strengthening ribs, and mounting hole positions for both motor and support feet.

These holes enable both the motor and support feet to be mounted in one of four positions as required.

Ball Bearings

All ball bearings are mounted on rubber inserts to reduce vibration (except for DAP-RC models which are supplied with die cast bearing housings).

The DAP-RC series are manufactured with an “L” shape profiled galvanised steel support frame.

This support frame is welded to the sides of the fan scroll to reinforce the unit forming a rigid cube structure.

In addition the frame includes a number of elongated fixing point holes to facilitate a multitude of installation configurations.
 
 
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