VTS Environmental Protection Covers: Features and Installation
Protection and Design
Available for both MDL and M-Series Rosahl membrane dehumidifiers, the VTS combines a plastic grille with a breathable PTFE sheet to protect against water, oil mist and dust contamination that could reduce performance.
Material and Design
The grille, made from durable mid-grey PETG plastic, provides mechanical protection and is designed for demanding environments. It withstands external conditions without compromising airflow or functionality.
The breathable sheet is a thin PTFE membrane with microscopic pores that allow air and water vapour to pass freely while blocking water droplets, oil mist, dust, and other airborne contaminants. The membrane is fitted as close to the Rosahl dehumidifier as possible.
Installation is further simplified as the VTS uses the same fixing centres as the membrane dehumidifiers.
Installation Instructions
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Insert two fixing bolts through diagonally opposite mounting holes from the textured (outer) side of the plastic grille.
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Place the Vapour Transmission Sheet (VTS) over the bolts, with its smooth surface facing the Rosahl membrane dehumidifier and its textured surface facing outward.
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Position the dehumidifier inside the enclosure in the required orientation. Check the alignment carefully, as some grilles and fixing holes are offset.
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From outside the enclosure, position the grille and VTS assembly so that the bolts pass through the enclosure wall and the membrane fixing holes. For MDL models, use the stainless steel mounting plate supplied with the appropriate MDL-*KIT.
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Fit the washers and nuts, then hand-tighten to hold the assembly in position.
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Check that all components are correctly aligned and that the VTS sheet is free from creases or trapped debris.
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Insert the remaining bolts and fit their washers and nuts. Tighten all fixings evenly using suitable hand tools. Do not overtighten or use power tools, as this could damage the grille or membrane.
Tightening torques
| Rosahl membrane | Part No. Plastic grille and VTS Sheet | Part No. Replacement VTS sheet only. | Suggested tightening torques |
|---|---|---|---|
| MDL-3 | MDL3-VTS | 311021 | 0.30–0.50 Nm (~ 2.65–4.43 lbf·in) |
| MDL-5 | MDL5-VTS | 311022 | 0.30–0.50 Nm (~ 2.65–4.43 lbf·in) |
| MDL-7 | MDL7-VTS | 311023 | 0.30–0.50 Nm (~ 2.65–4.43 lbf·in) |
| M-1J1R | M1J-VTS | 311024 | 0.15–0.20 Nm (~ 1.33–1.77 lbf·in) |
| M-2J1R | M2J-VTS | 311025 | 0.15–0.20 Nm (~ 1.33–1.77 lbf·in) |
| M-3M1R | M3M-VTS | 311026 | 0.15–0.20 Nm (~ 1.33–1.77 lbf·in) |
| M-3J1R | M3J-VTS | 311027 | 0.15–0.20 Nm (~ 1.33–1.77 lbf·in) |
| M-5J1R | M5J-VTS | 311028 | 0.15–0.20 Nm (~ 1.33–1.77 lbf·in) |
| M-7J1R | M7J-VTS | 311029 | 0.30–0.50 Nm (~ 2.65–4.43 lbf·in) |
| M-10J1R | M10J-VTS | 311030 | 0.35–0.60 Nm (~ 3.10–5.31 lbf·in) |
Additional Protective Measures
The VTS and grille plates are compatible with enhanced Rosahl rain covers enhance the overall protection of the membranes in harsh or unpredictable environments.
Westside-International Ltd
Boston House, Downsview Road, Wantage, Oxfordshire, OX12 9FF. UK