Radio studios
Radio studio: sealed booth and ducts with silent air
The booth is sealed so no noise gets in. The trade off is that no air gets in either, except through a single duct that has to do its job in silence.
By Limpieza de Ductos Panamá
In a sealed booth the diffuser and the return are checked, since they are the only way air gets in and out, then the branch feeding them, where dust and loose insulation produce flow noise, and the unit filter, which decides how much air arrives. If the booth smells stale when opened, the airflow is short or the return is blocked. The camera and the listening test are done between programs.
Sealed booth: little air and a lot of equipment
A voice booth is a small room with a heavy door, a double window and walls treated to absorb sound. Inside there is a console, computers, screens and two or three people. All of that produces heat and consumes the little air that comes in. The booth depends on a single diffuser and, at best, a return, both connected to a branch designed not to make noise: a generous cross section, low velocity and, often, a section of internal acoustic lining.
That silent design has a weakness: internal acoustic lining is porous and holds dust and moisture. With the 75.7 % mean annual humidity ETESA records for the district of Panama, a lined branch can load up and, according to the HVAC appendix of the EPA and NIOSH Building Air Quality guide, duct liner contaminated with microbiological growth should be replaced rather than cleaned. That is why in a booth the camera is used as much to see the condition of the lining as to see dust.
Microphone noise and diffusers
A broadcast microphone sits centimeters from the mouth and a few meters from the diffuser. Any whistle slips into the broadcast as a background hiss the listener cannot identify but does notice. The usual causes are few and are ruled out in order, from the simplest to the most laborious.
Climatiza is the technical service behind this guide and works with camera inspection, an illustrated report and cleaning only when the condition justifies it, including in the case of radio studios.
- Diffuser blades. If they are nearly closed to avoid a chill, the air comes out as a jet and whistles. They are opened evenly and the test is repeated.
- Branch damper. A half closed damper is a whistle. Its design position is found and fixed.
- Inside the branch with the camera. Dust at the diffuser neck, loose lining or a construction leftover produce flow noise that no adjustment removes.
- Unit and flexible connector. If the noise is a low hum, it comes from the unit through a rigid duct. The connector and the filter are checked.
Stale smell and the rotation of hosts
A booth is used in shifts: the morning show, midday, afternoon and night. Each team comes in, shuts the door and breathes the same air for hours. If a stale smell is noticed when the door opens between programs, the airflow arriving is less than the booth needs or the return is not removing the used air. The acoustic seal leaves no other route, so the duct is the only suspect.
- Stale smell when the door opens after a long program.
- Double window glass fogged on the inside on rainy afternoons.
- Return grille covered by an acoustic panel or by furniture.
- Diffuser blades closed by some host who felt cold.
- Filter of the unit serving the booths with an overdue change date.
- Heat rising during the program even though the unit is on.
The EPA, in its guide for building owners and facility managers, places occupancy and the amount of outdoor air among the factors behind complaints of heavy air. In a radio booth that balance is fragile because the space is minimal and the airflow was designed low to avoid noise. It makes sense to record in which program the smell appears and how many people were inside, before blaming the duct. Then the camera in the booth branch says whether the problem is obstruction or design.
Working between programs
A station broadcasts all day, but not every booth is on the air at once. The production booth, the alternate voice booth and the jingle recording booth have different gaps, and a station with two booths can move a program to the other one for an hour. With that rotation the full review of one booth fits in a morning, and the cleaning of a branch, if needed, in the overnight gap of automated programming.
| Task | When it fits |
|---|---|
| Listening test and blade check | Between two programs, with the booth empty for a few minutes |
| Reading and changing the unit filter | Any gap, without entering the booth |
| Camera in the branch and the return | Program moved to another booth, one hour |
| Cleaning or lining replacement | Overnight automated programming |
Report for the technical director
The technical director of a station answers for the on air sound and for the equipment, so the report is written in that language: one sheet per booth, with the result of the listening test before and after, the final position of blades and dampers, the camera photos of the branch and the return, the condition of the lining and the unit filter with its date. Whatever is cleaned follows the criteria that distinguish a duct needing cleaning from one that only needs adjustment.
Nothing is promised about health, because the EPA and the CDC note that duct cleaning has not been shown to prevent problems of that kind. What is delivered is air that arrives, that cannot be heard and that does not smell stale. The logic of closed booths with equipment running resembles that of an operator room with enclosed stations and continuous air, and the station offices follow the routine of an office that depends on the building system. When there are several booths, the estimation tools on this site help decide which one is checked first.
For a first conversation about the system, the contact details are on the Climatiza site and the method is described on its duct cleaning service page.
Sources
On this site
- Call centersHow the work is organized in this sector
- Offices and corporate towersA neighboring sector
- Camera inspectionThe real condition before deciding
Climatiza and Radar Panamá
Frequently asked questions
Can a fan or a split unit be installed inside the booth?
A split unit inside the booth puts the equipment noise next to the microphone and is usually ruled out. Before changing the design it makes sense to recover the airflow of the existing branch: open blades, new filter, clear return and clean branch.
Can the acoustic duct lining be cleaned?
If it only has surface dust and is intact, it is cleaned carefully and documented. If the camera shows lining that is loose, damp or with growth, the EPA and NIOSH guide says to replace it. The section is changed and the acoustic insulation is kept with new material.
Why does the booth window fog up?
Because there is more humidity and heat inside than outside, from people and equipment, and the double glass is colder. It is a sign that booth air is renewed little. The return and the diffuser airflow are checked before the glass.
How often should a booth branch be checked?
No standard was found that sets an interval. The criterion is the listening test and the smell when the door opens: if either changes, the branch is checked. The unit filter is read monthly and sets the pace for the rest.
Keep reading
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Do you want to know the condition of your system?
A camera inspection lets you see the inside of the ducts before deciding what to do. Message us and we will confirm availability.
- +507 6388-2083
- info@climatizapanama.com
- Calle Gervasio García, 8, Panama City