We have vulcan ducted heating. not much air comning from vents. what could be the problem

You can check the wiring but this looks like an incompatible controller. Here are some alternatives:

If you're looking to purchase an Evaporative Cooler Vulcan Touchpad Controller, there are several options available. Here are some places where you can buy one:

The Home Depot: You can purchase a DIAL Evaporative Cooler Digital Controller from The Home Depot for $64.48.
Gasstop: Gasstop offers a refurbished wired Bonaire Comfort Control remote that works with Bonaire and Vulcan gas central heating systems for $150.
Bonaire Heating & Cooling: Bonaire offers a range of Navigator Remote Controls for Cooler and Heater, including My Climate® Wi-Fi® for ducted evaporative cooler, ducted gas heater, or dual-cycle air conditioner.

Navigator Remote Control for Cooler and Heater (bonaire.com.au)

WE ARE NOT A SUPPLIER OF FURNACE PARTS

No it cant really be fitted as the evap system uses much larger duct and also in some cases people use a different type of duct that when running a gas heater threw it it tends to melt with the heat. Your best option would be to get new ducting that way you can size it correctly so you dont have air alance issues down the track.

Sound like you need to replace the heating element.
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With the car parked and engine idling, turn the ventilation control between windshield defroster and "open air ducts" to front and rear vents. Listen to pinpoint where the valves are that open and closes the air ducts. It sounds like the air duct to rear vents are blocked, and the cold air in rear air duct is coming from "outside ventilation." The air vent to allow hot air to the rear vent is stuck in "open ventilation" mode, like when you're driving in spring or summer months.

Do a continuity test on the heating elements, and if they're good then do the same on the sequencers or contactors, whichever you have. The sequencers (or if you have contactors turn on the heating elements). All the fan does is blow air. It blows against the heating element to put out hot air. Either your sequencers/contactor or your heating element is defective.Wait,each sequencers is connected to a fuse.Check the sequencer fuse too. Find the sequencer/contactor wherever the wire feeding the heating element is coming from.

There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Most common cause of pilot light problems is air movement. If your space heater exhausts gas through the roof, ensure the cap is on and level. If not, outside air movement will blow out the pilot. If you do not have an exhaust gas duct, check that the unit is positioned so that it does not blow air back onto itself from walls, furniture, etc, and ensure no other devices that move air are aimed towards the unit. The unit also needs to be placed away from central ducting, including return vents.

Hope this helps!

not possible