Acoustic enclosure design tool for HVAC engineers
Free preliminary sizing in a few minutes: outer dimensions, noise reduction to TA Lärm, pressure drop, wind load and budget price – with a design sheet and specification text. No sign-up required.
✓ Calculated locally in your browser✓ no cookies, no tracking✓ data only leaves your browser if you request a quote
1Which equipment needs an enclosure?
2Dimensions per unit
Optional: if the selected design does not meet the pressure drop or noise target, we suggest a different envelope or package – within this space.
Airflow and available pressure as per data sheet (nominal operation). Design standard: 800 mm from the unit to the outer edge of the enclosure in length and width, 900 mm in height for upward discharge or 100 mm for sideways discharge; for PV inverters 500 mm in length and width and 800 mm in height; air velocity max. 5 m/s, for heat pumps, chillers and dry coolers max. 7 m/s. The enclosure has no floor and is built around the equipment without contact.
3Acoustics
Optional: from the sound power level and the distance to the nearest receiver we derive a recommendation based on the limits of the German TA Lärm noise regulation.
Surcharges under TA Lärm: heat pumps and dry coolers are often tonal (compressor, fan blade-pass tone). Walls and corners next to the unit raise the level through reflection. The rest-period surcharge (working days 6–7 am and 8–10 pm, Sundays and public holidays also 7–9 am and 1–3 pm) applies during the day in purely and general residential areas and spa areas. If the background noise from other plants is unknown, the new unit should stay 6 dB below the limit (TA Lärm no. 3.2.1).
Note: The installation situation and background noise are usually not yet known at this early planning stage. Without input, the configurator calculates without these surcharges – the result may then be too favourable. We check both in the project-specific design.
4Specification
Wind zone according to DIN EN 1991-1-4/NA (Germany), e.g. from the DIBt wind zone map. For rooftop installation enter the building height.
Standard: anodised aluminium profiles, powder-coated panels, HSA3 inner lining (non-combustible, A1) with resonance cavity.
Your design result
Pressure drop close to the available pressure – engineering review recommended.
| Total airflow | 30,000 m³/h |
| Velocity intake / discharge (max. 7 m/s) | 1.1 / 3.2 m/s |
| Pressure drop intake + discharge approx. | 14 + 22 = 36 Pa |
| Available external pressure | 50 Pa |
Securing required: anchorage or ballast for approx. 12.0 kN tension on the long side and 20.1 kN shear.
| Wind zone 2, inland, top edge 3.8 m | qp = 0.65 kN/m² |
| Wind force long side / end face | 15.4 / 9.0 kN |
| Uplift force (roof suction) | 7.0 kN |
| Enclosure dead weight | 19.9 kN |
Generated from your current design – ready to paste into your bill of quantities. Please check the values before tendering.
All values are indicative. Binding design (acoustics, pressure drop, structural) is carried out per project by our engineering team, including CFD simulation.
Request a quote optional
Your configuration is sent along. We review the design for your project and usually reply with a quote within two working days.
We will review your configuration and usually get back to you with a quotation within two working days.
About ForCoTech: ForCoTech is the acoustic enclosure brand of Silent Engineering di Romolo Vicari (Osnago, Italy), built with Absora technology. Enclosures are engineered per project – acoustics, pressure drop and structural design, including CFD simulation – for heat pumps, chillers, dry coolers, VRF/VRV outdoor units and PV inverters. More about us: www.forcotech.com · Contact: info@forcotech.com · silent-mode.com
Example quotations from completed projects: B-01 Large heat pump with roof splitter package · B-02 VRF cascade: 10 outdoor units in 3 enclosures · B-03 Heat pump with tube silencer – 2 variants · B-04 PV inverters, free-standing with shelter · all example quotations →