Descriptions
The SJDK series hot air furnace is an innovative model featuring a simple system structure and an attractive appearance. It is ideal for customers who intend to add heating equipment while keeping costs low.
Its working principle is as follows:Fuel (such as coal, wood and other biomass fuels) is manually fed into the furnace chamber for combustion. The high-temperature flue gas generated by combustion is drawn into the heat exchanger by an induced draft fan, where it conducts heat exchange with clean cold air inside the heat exchanger to produce clean hot air. The hot air is then delivered through pipelines to heating and drying equipment such as ovens.
Schematic of stracture

Technical parameters
| type | heat amount output 105Kcal/h | air amount output (㎡/h) | coal combustion capacity (kg/h) | hot air temperature(℃) | cocking blower for cocking |
| JRF4-2.5 | 1.045 | 1500-560 | 60-200 | 10-12 | 炊事用鼓风80-100w |
| JRF4-4 | 1.672 | 3500-930 | 60-200 | 14-17 | 炊事用鼓风200-300w |
| JRF4-8 | 3.344 | 5600-1480 | 60-200 | 18-24 | Y5-47 No2.8C 1.1kw |
| JRF5-15 | 6.270 | 12000-2160 | 60-300 | 40-45 | Y5-47 No4C 2.2kw |
| JRF5-30 | 12.54 | 25000-4330 | 60-300 | 80-85 | Y5-47 No4C 3.0kw |
| JRF5-40 | 16.72 | 28000-5600 | 60-300 | 115-125 | Y5-47 No4C 3.0kw |
| JRF5-60 | 25.08 | 45000-8600 | 60-300 | 160-170 | Y5-47 No4C 3.0kw |
| JRF6-80 | 33.44 | 83000-12500 | 60-300 | 240-250 | GY2-111kw |
| JRF6-160 | 66.88 | 134400-23000 | 60-300 | 480-490 | GY4-118.5kw |
| JRF6-200 | 83.60 | 170000-28000 | 60-300 | 600-620 | GY4-118.5kw |