EQUIPMENT / EQUIPMENT FAMILY

HBO circulating hot-air packages · return-air temperature

A mobile electric hot-air package with a side-mounted fan, sold for recirculating process air.

From Hunan HBO · Industrial electric hot-air manufacture

Product guide · HVACDeck Editorial · Sources checked 2026-10-11

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Manufacturer catalogue image · Circulating electric hot-air package

01 / UNDERSTAND THE EQUIPMENT

HBO circulating hot-air package: ratings, inlet air and the return loop

HBO's circulating hot-air package is an electric process air heater on casters. A separate motor and fan sit on the side of a heater and control casing. Its poster gives 3–50 kW of heater power, top air volumes of 1.8–75 m³/min depending on size, 100–7,500 Pa of wind pressure and outlets from room temperature up to 350°C. All power and size options sit under this one family.

The same poster states room-temperature inlet air. That matters for a circulating system: if you plan to feed hot process air back into the unit, ask HBO for the return-air temperature the fan, bearings, motor, seals, insulation and controls are built for, and get it written on the selected model. A return loop also needs an air-path drawing and a heat balance for your process. The fan layout differs from HBO's compact portable heaters.

02 / READ THE CONDITIONS

Published parameters and their scope

This is an equipment family; ask the manufacturer to select the model that matches your duty.

Family designation: Circulating electric hot-air package

Swipe the table, or focus it and use arrow keys, to read the conditions and sources.

Manufacturer-published values · conditions are part of the specification
Parameter	Published value	Conditions and sources
Heating power	3–50 kW	Element power options; ask for total package input. Source
Air volume and pressure	1.8–75 m³/min; 100–7,500 Pa	Family ranges; ask for the fan curve and whether pressure is static or total. Source
Inlet air	Room-temperature inlet	As printed on the circulating poster. Source
Outlet temperature	Room temperature to 350°C	Outlet range; the allowed return temperature is a separate figure to obtain. Source
Layout	Separate side motor/fan and heater/control casing on casters	Internal air path and fan type come with the drawing for your order. Source
Data to request for recirculation	Return-air limit, air-path diagram, purge/makeup conditions and selected test	No energy-saving figure is published. Source

Selection and application

Inlet temperature decides the loop

HBO prints room-temperature inlet air. Before closing a loop, ask whether a circulating build is available for your actual return temperature, and get a stated limit for the fan, motor arrangement, seals, insulation and heater inlet. The 350°C figure applies to the outlet only.

Ask for the circuit drawing with return, fresh-air and exhaust connections as your design needs them. The product name leaves open whether the process runs open, partly recirculating or fully closed. Attach any change HBO makes to the construction to the quotation revision.

Process air and heat duty

State the delivered airflow, the process inlet and outlet temperatures, the return condition and the system resistance, all at one operating state. Name any moisture, dust or vapour the process adds. HBO then sizes the heater and fan for those conditions; heater kW on its own says nothing about drying or moisture removal.

The 75 m³/min, 7,500 Pa and 350°C figures are separate limits and do not occur together. Ask for the reference volume, the pressure convention and the selected fan curve. Include filter, duct and process losses clean and in service, and check the pressure margin left after your ductwork.

Controls when return conditions change

A recirculating process can feed the heater air far warmer than an ambient test. Ask for the sensor positions, control sequence, heater switching and a separate over-temperature cut-out. Get HBO's stated response to a fan trip, low airflow and a change in the process connection, and test each one.

Agree which electrical loads are in the supply and the total package input. If energy saving matters, define the reference equipment, process output and measurement period and measure it on site. Ask which communication protocol the controller offers.

Accepting the connected unit

The photograph shows casters, handles and a side fan. Ask for the ordered dimensions, handling instructions and service access to the connected ducts, plus guidance on moving the unit and on outdoor use.

At acceptance, record the inlet and return conditions, delivered airflow, pressure on the agreed basis, settled temperatures and total input with the full circuit connected. Check the protective sequence on its own.

Settle the return temperature
Replace the ambient-inlet wording with a stated limit and air circuit for the selected model.
Select the process duty
Return conditions, air composition, delivered airflow, pressure and heat demand.
Test the connected assembly
Measured air, thermal and electrical figures and the protective controls.

Confirm in writing before ordering the circulating package

Put these questions to HBO and keep the signed answers with the order: the highest return-air temperature the selected fan, motor, seals and insulation accept; the airflow and pressure at your duty on a stated basis; the heater power and total input; the fresh-air and exhaust connections needed; the over-temperature cut-out and its setting; the response to fan failure; noise at a stated distance; and price and delivery.

Sources

Compiled by HVACDeck Editorial. Figures are as published by the manufacturer; ask for test records for the unit you select.

Official HBO circulating hot-air package pageChecked 2026-10-11 · Parameter poster, main image and several views of the circulating package, including the room-temperature inlet statement.

Editorial method and corrections · Report a detail with this page URL