The TT690 manual negative pressure unit is our smallest and lightest device intended for residential renovations. Sufficient for dust control in areas smaller than 35 m² (90 m³), which allows for approximately 6 air changers per hour.
Product info and a quote requestTT800D is a negative pressure unit equipped with a display, with an integrated digital precision pressure gauge, energy consumption gauge, and operating hours gauge.
Product info and a quote requestTT2500D is a negative pressure unit equipped with a display, with an integrated digital precision pressure gauge, energy consumption gauge, and operating hours gauge.
Product info and a quote requestTT5000D is a negative pressure unit equipped with a display, with an integrated digital precision pressure gauge, energy consumption gauge, and operating hours gauge.
Product info and a quote requestTT7000D is a negative pressure unit equipped with a display, with an integrated digital precision pressure gauge, energy consumption gauge, and operating hours gauge.
Product info and a quote requestA negative pressure unit prevents fine construction dust from spreading into other areas. Partition the area under renovation using plastic sheeting with zipper doors supported by adjustable poles. The multifunction air filtration device and negative pressure unit can be located inside or outside of the partitioned area.
In a larger space it may be impossible or impractical to partition the area and provide ventilation. In this case, it is advisable to position the device as close to the origin of the construction dust as possible.
It is often necessary to increase ventilation to speed up the drying of paint or filler or to remove solvent fumes from the working area.
The G4-rated active carbon filter available as an accessory for the negative pressure unit allows you to remove unpleasant smells from the air.
First decide how you will partition the area to be renovated. Then calculate the volume of the space (m³). If the client requires a specific air change rate (for example 6 times per hour), multiply the volume of the space to be depressurized (m³) by the negative pressure unit's air flow (m³/h). The resulting figure is the minimum the negative pressure unit must be capable of producing while equipped with filters.
In practice, sizing must also take into account filter contamination, connector assemblies and hoses, as well as leaks in the space. These increase the required capacity, and therefore the capacity required from the negative pressure unit. This is why negative pressure units should be 'oversized' compared to the optimal situation, to ensure sufficient ventilation is achieved.
Each filter, hose, and connector produces counter-pressure on the motor of the device. All of the above reduces the air volume produced by the negative pressure unit for their part. As the filters accumulate dirt, their resistance increases, and the air volume produced by the device is gradually reduced. Once the counter-pressure becomes overwhelming, the motor stops.
Temporary partition walls can be constructed using, for example, spring-loaded installation poles and plastic sheeting. All seams must be taped to seal any leakage points. However, it is necessary to provide replacement air to the area under negative pressure if the area is otherwise airtight. Excessive negative pressure can cause particles to be released from structures, makes opening doors more difficult, consumes energy unnecessarily, and may damage the temporary partition walls. Openings can be constructed using, for example, plastic zipper doors.
The negative pressure unit is often best placed inside the area under negative pressure, close to the source of the dust. This way it draws dust into the filters more effectively.
If the renovated or partitioned space is very small, it is advisable to place the negative pressure unit outside of the area.
To achieve negative pressure in the first place, the air from the negative pressure unit and the partitioned area must be directed outside or into other areas of the building. In this case, exhaust ducting provides an affordable option.
