Several of the motor homes we've looked at had what looked like white, 4" round vents on the front face at the bottom of the couch. What are they for? They can't really be vents can they?
Yes... My AquaHot system has one in the base of the sleeper sofa. All the other vents (output) are in clear areas of the walls or cabinet bases, but, in order to keep us (the sofa users) nice and cozy, they put one in the front of the sofa that blows out on our feet while we watch the television. Super nice in the winter!
Furnace vents (Warm air comes FROM them) Instead of the floor vents on some of the coaches (Junk/dirt always falls into them) Higher end coaches and newer etc use "wall" vents and under counter vents and since the couch covers the wall ....
When they first started making slide outs the manufactures hadn't got their designs quite right and many of the RVs had their heater vents under the slide out floors when the slide outs were closed. It was a big problem when RVs were on the road. Now they are getting better. Most of the heat vents and return vents to the furnace are in the walls etc. They won't be affected if the slides are opened or closed. Those vents could be heat vents or return vents.