82 Application RAK-S-type appliance has been developed for cleaning the air from welding fumes arising at mobile or stationary work- places. The device is efficient in capturing the dry, as well as viscous dusts, that arise during welding the oil-laden steel sheet and while using the anti-spattering liquids in large amounts. The device is not equipped with a waste container to collect impurities. Those are captured within the structure of the compact filter, being the basic filtering element in the device. Additionally, there is also a spunbond filter, absorbing the part of gaseous contamination. At the moment the filters reach the extreme pollution degree, replace them for new – they cannot be submit to regeneration. Structure RAK consists of subsequent elements: • steel housing, • radial fan, • pre-filter – wire mesh of 0,8x0,25 mm holes, • filtering pad – class G-3, • compact filter – class F-9, • active carbon impregnated spunbond filter, • control unit, • castor assembly for the mobile version, or a set of brackets for the wall mounted version. Operational Use Mobile version (RAK-M) is designed for installation of extraction arms on its top cover. Stationary – wall-mounted version (RAK-H) extraction arms have to be installed at the housing bottom. The device is manufactured in three sizes, adapted for installing of one, two or three extraction arms of Ø160 mm diameter and of 2- or 3-metre-workrange. The appliance is oper- ated by means of a control unit. In the mobile version, the control unit is built-in on the housing, whereas for the stationary version, the control unit has to be installed, in a convenient place chosen by User. Periodical maintenance of the filter consists in: • periodical cleaning the pre-filter of wire-mesh, • periodical replacement of the filtering pad and the carbon spunbond (every several months), • periodical replacement of the compact filter (period depends on the intensity of use). * On demand we deliver RAK-S filtering units equipped with a pressure control that indicates the replacement necessity of the compact filter (signal lamp). Technical data Type Part No. Volume flow [m³/h] Maximum vacuum [Pa] Supply voltage [V] Motor rate [kW] Acoustic pressure level [dB(A)] from distance Weight [kg] Quantity of the connections for ERGO arms 1 m 5 m RAK-X-M/1-S 800O37 2350 2600 230 1,1 74 70 115 1 RAK-1-M/2-S 800O38 2500 2000 230 1,1 71 68 165 2 RAK-1-H/2-S 800O39 RAK-2-M/3-S 800O40 3050 2250 3 × 400 1,5 71 68 210 3 RAK-2-H/3-S 800O41 Caution: 1. Volume flow has been measured at the clean filters. 2. Full presentation of the ERGO extraction arms is on separate catalogue cards. RAK-1-M/2-S RAK-2-M/3-S RAK-X-M/1-S RAK-S Welding fumes