Roof vents are used to ventilate humid air out of the attic area of the house to increase the air conditioners ability to cool air down or the heaters ability to heat the air. Roof vents can also suck humid air into the attic and eventually rot the roof over time if the air flow is off balance though.
The vents outside the house are typically located on the roof or on the sides of the house near the ground.
House vents are typically located both inside and outside the house. Inside the house, vents are usually found in ceilings, walls, or floors to allow air to circulate. Outside the house, vents are often located on the roof or walls to allow for proper ventilation.
I would recommend putting in roof vents. We have this same problem with our attic and we have put in roof vents and also insulated it so that we can keep the heat down throughout the rest of the house.
Bathroom vents typically go outside of a house through the roof or a side wall to expel moisture and odors.
Roof vents are installed on roofs to allow for proper ventilation and air circulation in the attic space. They help to regulate temperature, reduce moisture buildup, and prevent damage to the roof and structure. Common types of roof vents include ridge vents, soffit vents, gable vents, and turbine vents.
They're "vent boots." When you have a protrusion in your roof like a vent pipe, a boot is installed around it to keep rain out of the house.
Birds nests or squirrel nests on the roof in the vents
The purpose of having roof vents are the following; preserving the life of the roof, reducing the moisture inside the roof, maintaining the right ventilation inside the roof to avoid molds and moisture and for aesthetic and style purposes as well.
WHICH VENT If you're talking plumbing roof vents or soffit or ridge attic air vents; absolutely not!! I can't thing of a single vent that would be opened and closed at will.
Plumbing vents work by allowing sewer gases to escape outside the house through a pipe that extends above the roof. This creates a pressure balance in the plumbing system, preventing the gases from entering the house through drains or fixtures.
The best way to build a house in West Africa is by getting a lot of bricks and cement and some wood for the roof. To make the roof you have to make a layer of bricks (bricks see!) and then a wall of bricks going up and then get a net and attach it to each corner of the bricks going up and make a thatch roof of lay them on tying them up the occasional pair (thatch would be better) then get white paint and paint the house white will make the house colder because black attracts the sun and white reflects your house will be strong from attack and good for a place to chill.
When you say "exhaust vents in your ceiling" I assume you are referriong to the heating and AC vents inside your house and not the roof vent on the outside used to vent the attic. It is most likely that the duct work was ran in the ceiling for ease of installtion or the house may be built on a slab and they did not want to run the duct work through the slab.