Ventilation grille for frame installation W428 with V-blade
Medium-duty version, blade spacing 33
Ventilation grille for frame installation with V-blades,
medium-heavy version, lamella spacing 33
Ventilation grille for frame installation with V-blades,
medium-heavy version, lamella spacing 33
Ventilation grille W428, back side with stainless steel fly screen
Ventilation grille for frame installation with V-blades,
medium-heavy version, lamella spacing 33
Material
Made of aluminum profiles AlMgSi 0,5 (according to EN 12020-2)
Stainless steel insect screen on request
Silver color (E6/EV1) - bronze color (E6/C34) (20 micron) anodized or powder coated according to RAL colors (60-80 micron)
Waterproof
Dimensions
Slat spacing: 33.3 mm
Clamping thickness: 24 or 28 mm
Please specify when ordering: Width x height in mm (overall dimensions)
Minimum dimensions: 220 x 220 mm
Mounting
Installation like double glazing
Use of block bridges is recommended
Options
Water drainage channel
Watershed
Removable insect screen
Metering ventilation grille W428/VA
Sectional drawing ventilation grille W428
Technical data ventilation grille W428
Technical data
| Air diffuser | (EN 13030) |
| K-factor (supply) | 61,04 |
| K-factor (discharge | 61,04 |
| Ce coefficient | 0,128 |
| Cd coefficient | 0,128 |
| Optical free cross section | 59% |
| Physical free cross section | 43% |
| IP class (ventilation grille with insect screen) | IP2XD |
| (Electrical installation at least 105 mm from ventilation grille) |
Tender texts
Ventilation grilles with puncture-proof horizontal V-blades made of aluminum (AL Mg Si 0.5),
slat spacing 33,3mm, with clamping frame 24mm for installation in glazing rebate or P/R construction, natural anodized / coated in RAL ...., with backside
Stainless steel insect screen,
Total dimensions of the grids : ... x ...mm
Make: rotec ventilation grille Berlin
Model: W428 for wall mounting
Item no.: W428
English 
German