Centrifugal, axial and mixed-flow fans, and what a smoke-extract rating means
Choose the fan type for the system first, then check whether any fire duty is actually certified.
Buyer specification notes
Practical equipment briefs from HVACDeck Editorial.
Importing HVAC equipment from China: the conformity documents to request
A CE mark is a conclusion, not evidence. Ask for the documents behind it for your product and market.
Equipment sound data: sound power, sound pressure and how to compare them
A decibel figure means little until you know whether it is power or pressure, and how it was measured.
Cooling tower selection: range, approach, wet-bulb and certified ratings
Three temperatures decide most of a cooling tower enquiry. Get them right before comparing cells and fans.
Compressor types in chillers and condensing units: scroll, reciprocating, screw and centrifugal
What the compressor tells you about capacity range, part-load behaviour, oil and service.
Refrigerants in HVAC quotations: GWP, safety class and market rules
Read the refrigerant line before the price: it decides where the unit can be sold, installed and serviced.
Ventilation fan enquiries: define the duty point
Ask for a matched flow, pressure basis and selected configuration.
Plate heat exchanger enquiries: the inputs to send
Describe both fluid circuits before asking a supplier to choose an exchanger.
Chiller quotations: full-load and part-load performance
Build a comparison that states the duty, rating basis and equipment boundary.
Heat pump quotations: compare capacity at the design temperature
Separate a catalogue nameplate value from the duty your project actually needs.
Choose a worksheet for your quotation
Each guide combines a procurement workflow with a blank CSV that buyers and suppliers can fill in. Examples are editorial templates, not field tests or product performance results.
Heating and cooling equipment
Use the heat-pump sheet for source/delivery conditions and system integration; use the chiller sheet for evaporator/heat-rejection schedules and the included-energy boundary. Keep exact model declarations and selected operating points separate from family descriptions.
Heat transfer and air movement
Use the plate-exchanger sheet to document both circuits and material/pressure constraints. Use the fan sheet to define airflow, pressure type, air conditions and curve basis. The worksheet’s document/revision and clarification columns preserve unresolved evidence.
Return and review
Download the blank sheet, fill the buyer requirements and send the same issue with your project drawings to each shortlisted supplier. Ask them to complete response and document columns. Review incompatible conditions before comparing values, and keep unanswered items pending.