What would happen if something fell through the holes on top of my 8030901 Climate Control Footrest and got inside of the product?

Dust or crumbs should not cause smoke and definitely not fire.  The heater is low wattage and will not get remarkably hot.  The fan will also blow dust back out that has fallen into the product.  Normal heaters that are in the market are in the 1500 watt + range.  This is a 250 watt product.