Dimensions and technical details Adjustable wall duct for axial-flow wall fans Various size options available Material: galvanised steel sheet, circular 10 mm brim on both ends Size adjustable between 250 - 450 mm Application: in walls with up to 470 mm thickness, duct can be shortened on-site for walls with less than 250 mm May only be combined with EX-rated wall fans if both ends have been grounded according to VDE guidelines Model Drill hole (mm) Inside C (mm) D (mm) Outside Weight (kg) Ø A (mm) Ø B (mm) Ø F (mm) Ø G (mm) TWRH 170 183 170 190 250 230 173 193 1.4 TWRH 220 233 220 240 250 230 223 243 1.8 TWRH 270 283 270 290 250 230 273 293 2.2 TWRH 330 343 330 350 250 230 333 353 2.7 TWRH 375 388 375 395 250 230 378 398 3 TWRH 440 453 440 460 250 230 443 463 3.8 TWRH 470 483 470 490 250 230 473 493 3.9 TWRH 525 538 525 545 250 230 528 548 4.3 TWRH 620 633 620 640 250 230 625 645 5 TWRH 645 658 645 665 250 230 650 670 5.3   Model Compatible with TWRH 170 M 150 - MF 150 - Novus LHV 160 TWRH 220 EQ 20 - Novus LHV 160 TWRH 270 E 25 - E-Ex 25 - EQ 25 - EQ 25 Ex - EQ 25 Eco - EQ MD 25 - EQ HD 25 - MP 25 TWRH 330 E 30 - E-Ex 30 - EQ 30 - EQ 30 Ex - EQ 30 Eco - EQ MD 30 - EQ HD 30 - MP 30 TWRH 375 E 35 - E-Ex 35 - EQ 35 - EQ Ex 35 - EQ 35 Eco - EQ MD 35 - EQ HD 35 - MP 35 TWRH 440 E 40 - E-Ex 40 - EQ 40 - EQ Ex 40 - EQ 40 Eco - EQ MD 40 - EQ HD 40 - MP 40 - Novus LHV 400 TWRH 470 E 45 - E-Ex 45 - MP 45 TWRH 525 E 50 - E-Ex 50 - EQ 50 - EQ Ex 50 - EQ 50 Eco - EQ MD 50 - EQ HD 50 - MP 50 TWRH 620 E 60 - E-Ex 60 - MP 60 TWRH 645 EQ 60 - EQ Ex 60 - EQ 60 Eco - EQ MD 60 - EQ HD 60