Hold-down air suction blower

[true_lady]

Здравствуйте,
может кто-нибудь знает, что такое Hold-down air suction blower?
я даже приблизительное описание на англ. нашла, но всеравно не могу придумать русский вариант перевода.
A holddown device is disclosed for use with a automatic machine tool, such as a CNC router. The holddown device comprises a flat box having a hollow interior forming a reduced pressure chamber therein and having a planar work surface for placement of workpieces to be engaged by the machine tool. The chamber formed in the interior of the box is connected to an air evacuation device which is capable of moving large volumes of air.

мой контекст:

Hold-down air suction blower RF 4-5200, 44000 m3/h, 2500 Pa
Drive: AC motor, frequency-controlled.
Installed drive rating: approx. 55 kW.

Помогите пожалуйста!
Without sound absorber