The below is the window unit type which is located on the 2nd floor and the 3rd floor is occupied so does the ground floor. The owner of the farm must be a great swiftlet enthusiast.
As you could see some failed one the entrance hole is way too small.
Rawang is a true swiftlet farm area and for those who want to invest here I guess it won't be costly as there are many abandoned shoplots here "But Make Sure" your farm is swiftlet friendly.
Hope the above pictures are informative to all readers.