Comes with a millivolt valve with a standing pilot and variable flame remote control via remote. The general rule of thumb when picking a fireplace insert is leaving 3-5 inches on either size of the unit to the firebox wall. This will most likely ensure proportionate sizing, but there are some exceptions. For Standard sets - 18" / 24" / 30" (width)

See-Thru sets are available as well in the above sizing. Call for pricing on those.