Turn off the power to the furnace at the circuit breaker.
Open the front access panel to the furnace by releasing the catches and pulling the cover off.
Loosen the screws to the control panel in front of the squirrel cage, if there is one, by removing the two screws. Let it hang in place.
Reach back into the unit and use a ratchet to loosen the bolts holding the squirrel cage. Hold one hand underneath to prevent it from dropping. Use a 7/16-inch socket for the nuts.
Remove the squirrel cage from the unit once the nuts are removed.