DMA
Compare modular construction, selected insulation, seals and drainage.
EQUIPMENT / EQUIPMENT FAMILY
Dunham-Bush DMA / DAHU / CAHU · Configurable AHU section selection
Compare three related AHU offers in one selection file: casing, air states, filtration, drainage and actual controls.
From Dunham-Bush (China) Industrial Co., Ltd.
Individual product research · HVACDeck Editorial · Sources checked 2026-10-11
Choose the AHU section schedule before selecting its catalogue name
Dunham-Bush offers DMA modular, DAHU combined and CAHU clean-type air-handling units across a published 1500–150000 m³/h family range. These closely related configurable AHU offers are compared on one page rather than split into similar catalogue entries. DMA describes selectable polyurethane/rock-wool insulation, sandwich casing, dual seals and an inclined drain pan. DAHU describes an insulated labyrinth casing and lists casing performance classes CD1, CL1, CB1 and CT1. CAHU adds positive-pressure supply, optional stainless components and a standard extended filter description.
The supplier describes more than thirty functional sections and optional temperature/humidity, frost, filter and fresh-air controls. No selected coil duty, fan pressure, filter class or cleanroom performance report was inspected. The published CRAA/AHRI and European-test statements remain supplier claims pending exact-model/report verification. None establishes aseptic operation or guaranteed absence of bacteria. A useful selection fixes an air-state schedule and section-by-section construction, then specifies access, drainage and controller scope for the actual application.
Published parameters and their scope
This is an equipment family; its range does not identify one orderable configuration.
- Family designation
- DMA / DAHU / CAHU
Swipe the table, or focus it and use arrow keys, to read the conditions and sources.
| Parameter | Published value | Conditions and evidence |
|---|---|---|
| Compared families | DMA modular, DAHU combined, CAHU clean-type | One page for related configurable AHUs; no model-variant URL multiplication. Source |
| Published airflow span | 1500–150000 m³/h | Does not determine cooling/heating duty or external pressure. Source |
| DMA casing features | Sandwich panels, selectable insulation, dual seals, inclined pan | No measured leakage/thermal schedule reviewed. Source |
| DAHU casing statements | Labyrinth insulation; CD1/CL1/CB1/CT1 classes | Supplier report/certification statements not independently checked. Source |
| CAHU design distinctions | Positive-pressure supply; optional stainless parts; extended filters | No guaranteed sterility or cleanroom qualification. Source |
| Optional functions | Filtration, humidification, heating, sound treatment, recovery and controls | Selected equipment list needed; not every function standard. Source |
Selection and application review
Freeze the air states and fan duty first
Issue design and part-load outdoor/return/supply air states, fresh-air fraction, airflow, external pressure and noise requirements. Ask for a selected section schedule with coil capacities, water conditions, fan curves/input and pressure losses for clean and loaded filters. The common airflow range cannot establish any of those selected duties.
Show duct connections and room pressure relationships. Where CAHU is considered, define the actual positive-pressure arrangement and control response; a product name does not qualify a cleanroom or pharmaceutical process. Agree commissioning measurements for the whole air system.
Compare casing construction with report scope
Request selected casing thickness, insulation, access-door seals and tested mechanical/leakage/thermal performance at the ordered pressure. DAHU/CAHU list casing classes and certification claims, while DMA describes construction features. These are different types of source information and are not converted into equivalent independent tests.
Obtain the actual report, tested size/construction and exact current certification holder/model before making contractual comparisons. Do not apply a family report to every customised casing. Freeze shipping modules, site assembly, access clearances and the responsibility for assembled leakage testing.
Make filtration, humidification and drainage maintainable
Select actual filter grades, access side, spare sizes and changeover criteria. CAHU's extended-filter wording does not provide a numerical filter class; optional stainless parts require an ordered materials schedule. Define cleaning access and the site's hygiene procedures. No bacterial-elimination guarantee is inferred from the supplier's wording.
Choose humidifier technology and water/power requirements from the actual application, then obtain maintenance and drainage details. Approve pan slope, traps, condensate connections and service space against the selected pressure arrangement. Purification or disinfection options need their own applicable suitability evidence.
Order controls and accept the complete selected unit
Identify which temperature/humidity/frost/filter alarms, dampers, sensors and actuators are included. DMA describes these as optional controls. Obtain a point list and cause-and-effect schedule and assign plant/BMS authority, startup and fault behaviour.
Acceptance should verify actual airflow/pressure, coil duty, casing performance within the report boundary, drainage, access and installed controls. The manufacturer selection-software claim does not replace an issued project selection. Current price, lead time and independently tested installed air quality remain unknown.
DAHU
Verify labyrinth casing and the exact class/report boundary.
CAHU
Specify positive-pressure, materials, filters and project hygiene qualification.
Sources and review scope
Compiled by HVACDeck Editorial. Source review identifies what the publication states; it is not an independent performance test or certification.
- Official DMA modular AHU pageChecked 2026-10-11 · Complete section/casing/optional-control descriptions and rendering read.
- Official DAHU combined AHU pageChecked 2026-10-11 · Full casing classes and certificate claims read; issuer records not checked.
- Official CAHU clean AHU pageChecked 2026-10-11 · Full positive-pressure, materials and filter wording read; no sterility guarantee adopted.
Editorial method and corrections · Report a detail with this page URL
Turn the evidence into an enquiry
Send the manufacturer your required duty, installation conditions and the unresolved items identified in this brief.
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