This is for moderate venting in professional applications. 4" ducting is very versatile and this unit can be used in a variety of applications such as venting rooms, closets, projector enclosures, video walls... For most professional applications we recommend the EC units but this unit is ideal for when advanced and variable speed control is not beneficial.
Due to the trend of addressing cooling and venting earlier in projects, during pre-construction/renovation, Cool Components has greatly expanded their line of duct fans. Using duct fans is superior in most respects and primarily because the fans are quieter, move more air, very efficient and are simply out of the way since they will installed usually in an attic, crawl space, or basement. With proper planning they should also be easily serviceable. Duct fans, as the name implies, utilize ducting to connect the fan unit to the areas where wish to remove air (intake) and directs that air to another area or preferably, to the HVAC return vent (exhaust). Generally the inline duct fans feature multi-speed motors and are powered with 110/120 current (220V versions are available via special order).
There are several units available ranging from Residential to Professional versions with the primary difference being the residential housings are made from ABS while the Pro versions have a Polypropylene housing and come with optional EC (Electronic Controllable) fan motors. This is the latest advancement in inline duct fans as it allows high voltage fans to be controlled with low voltage controllers. Traditionally high voltage fans were only reliably controlled using 'step' control meaning there were 3 or 4 speeds that increased in a progression that usually left you hearing each time the unit took a 'step'. The EC fans provide for a smooth linear progression so the fans start slow and ramps the speed up smoothly as the temperature rises. As with all of Cool Components products, serviceability is also a key as the fan unit can be separated and cleaned without removing and having to re-attach the ducting. Then at the end of the life of the fan, it is very easy to swap out the fan also without removing the ducting. Another staple of these fans and the latest technologies is that the units are very efficient and are also fully recyclable.