Maintenance & Warranty
How often do I need to wash my fabric duct?
This is one of the most common questions and one of the most difficult to answer because it depends entirely upon the AHU System, level of filtration, the cleanliness of the air in the immediate environment of the Fabric Ducting system(s) and the type of material used and also the type of diffusers used.
Fabric ducts need washing for one of several reasons:
(1) The duct has become blocked with dust and is causing system inefficiency and loss of performance. This is actually rarer than you might think. It is commonly caused by poor filtration management in AHU systems using permeable fabric ducts with micro-perforations only. This duct will need turning inside out and vacuuming to remove most of the dust prior to washing.
(2) The duct has signs of dirt on the outside and it is no longer aesthetic. This is dust from the room the fabric duct is mounted in. The dust gets entrained in the air pattern and settles on the duct, usually near the laser cut perforations. There is not normally a loss of performance in this situation. The duct can be wiped down, vacuumed or removed and washed depending upon the internal level of dust build up.
(3) The hygiene requirements of the room/system require regular cleaning. This is usually a food or cleanroom situation. Cleaning will need to be undertaken as a requirement of the hygiene systems within the organisation, rather because of a lack of performance or visible dust deposits.
From our perspective, we don’t insist on cleaning annually as part of our warranty terms and conditions unless there is a significant percentage of air travelling through micro-perforations. Other than this, it’s really a question of common sense and the guidelines above.
It’s fair to say that eventually most fabric duct systems will benefit from being removed and cleaned. The ideal time will be when access is available and the system is not required (unless one has a spare system so that rotational cleaning can take place).
At Prihoda UK, we have our own in-house laundry facility. We can wash and dry fabric ducts (of any manufacturers type) for a wide variety of customers. By having this service in-house, we control the quality of the wash – in terms of temperatures and detergent products used – and the critical temperature of drying.
We survey each duct and spot when repairs are required. We are able to offer fast turnaround times and additional treatments (anti-bacterial – anti-fungal etc).
We also offer a removal, installation and storage service for spare systems. Please don’t hesitate to contact us to discuss your requirements further.
1. Very dusty diffusers: unzip each section and carefully remove the fabric duct from the track section by section. This minimises the weight gradually and reduces the stress on the track. Take it to a convenient place and vacuum it, using a softbrush. Turn inside out and vacuum the inside.
2. Polyester Ducts: wash in washing machine with industrial washing detergents (dosing as per supplier recommendation), at 40 °C. We recommend spinning at 400 rpm and intensive rinsing. According to the contamination level cycle of washing, this can be repeated or a stronger detergent used. Use an adequate detergent for hand washing. Traditional diffusers are not machine washable. These can usually be effectively cleaned by vacuum cleaner, floor cloth or water stream.
3. Add disinfection into the wash if required as part of your hygiene process. The chemicals used for disinfection must not affect the fabric (see the washing symbols). Detergents dosing as per supplier’s recommendation.
4. Either drip dry the diffusers well after washing and install or install slightly damp and allow the supply air to dry the ducts. DO NOT TUMBLE DRY or in any other way heat the fabrics during drying above 40oc as this may result in damage.
5. DO NOT STORE DAMP – mould can occur and this damage is impossible to remove completely.
Medium weight polyester fabrics such as Prihoda Regular, Prihoda Premium and Recycled Material. This is 99% of the material specified in the UK.
Membrane diffuser, servomotors, all other fabrics and Squairetex Products.
All other items not mentioned above, unwoven accessories (zips, hooks, etc, printing, assembly and accessories).
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Any questions? Please contact us
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