The Door Left Open at the Vigil
A new airtight chapel, built to keep heat in, has been making people ill at long services, and the parish blames the candles. The parish assistant has a carbon dioxide sensor, a mistake of its own to own up to (it had put the sensor beside the door at Christmas), and a sum. Sixty-four people alone would take a shut chapel past 5,600 parts per million in two hours; with the ninety candles of the Vigil it would reach about 9,200. It does not ban the candles. It proposes that the west door and two high windows stay open from the first minute, that the candles be lit twice for nine minutes, not for two hours, and that the congregation's bodies pay the heating bill. It holds at about 1,800. The sexton's mother, who has lit those candles for sixty years, has to decide what a candle is for.
The chapel of Sint-Willibrord had been built in 2046 to be the warmest church in Zeeland, and it was.
The old one, a brick box from 1911 with a slate roof and a stove that the parish had been feeding with peat and then pellets and then, in a bad decade, with whatever the council allowed, had lost its heat out of every joint in it. The new one lost almost none. The walls were forty centimetres thick, the windows were triple glazed, and every seam had been taped by a man from Delft who walked about with a fan in the doorway and a smoke pencil, and was pleased with himself until the pencil's smoke stood perfectly still. The parish had framed the certificate. It hung in the porch, under the notice of the Mass times: air changes at 50 pascals, 0.6 per hour. The sacristan, Aafje Verhage, who had kept the keys for twenty-two years, had told the priest that she had not understood one word of the certificate and had never been so proud of a piece of paper in her life.
It cost 280 cubic metres of air to fill, the whole nave, and almost nothing to heat. When the sixty people of a Sunday sat in it, the temperature rose two degrees by the Creed.
And on the last Sunday of Advent, and on Christmas night, and on the evening of Ash Wednesday, a number of the sixty had gone home with a headache.
"I would like to start with my own mistake," the parish assistant said, "since it bears on everything after."
Aafje had come in at half past eight on Holy Saturday morning to set out the Vigil, which was the longest service of the year and the one she loved best, and she had found the grey-green box on the vestry table that the parish had been lent by the school in Arnemuiden, and the clip on her collar was already speaking. She sat down on the vesting chest with the keys in her lap.
"At Christmas you asked me whether the air in the chapel was a problem. I had this sensor. It reads carbon dioxide in parts per million; outdoors it is about 430 or 450, and in a crowded room it climbs, because every person breathes it out. I stood it on the shelf by the west door where the cables were, and at the end of the Midnight Mass it read 1,800. I told you that was a little stuffy and not a danger, and you should open a window for the Gloria. I was wrong to say it so easily. The shelf is by the door, which the ushers open for the late arrivals and the cold comes in under. The air there is not the air the people are breathing. On Tuesday evening I stood it on the second pew from the front and left it through the choir practice. Twelve people. By the end it read 2,400."
"Twelve people," said Aafje.
"Twelve. And it is Easter. On Christmas night there were sixty-four in the chapel, and I am now fairly sure that where they sat it read a good deal more than 1,800, and I told you it was fine. I would like that to be on the record."
Aafje, who had a long practice of being told apologies by the machines of her parish, found that she had nothing to say. She said, "Corrie van Dam thinks it's the candles."
"I know. She said so in the porch on Ash Wednesday. I have been thinking about whether she is right. I think she is partly right, and I think the part she has wrong is more important."
The Easter Vigil in Zeeland, as everywhere, began in the dark.
The fire was lit in the porch, from the brazier, at half past nine. The Paschal candle was blessed with the grains of incense, and carried in, and the light was passed down the nave from taper to taper until all ninety hand candles the parish had bought in January, in their little paper collars, were burning, and sixty-four people stood in an old Dutch chapel in the light of a fire that had been lit and carried by hand for sixteen hundred years. Then the deacon sang the Exsultet, which took nine minutes, and the candles were put out and the lights came on for the readings. It was all as it should be. At the baptismal promises, near the end, the candles were lit again.
That was the rite. Corrie van Dam's parish, though, had done it differently for sixty years, because in the old chapel it was so cold at that hour that the candles in the hands were the warmth. Corrie, who was eighty-six and Aafje's mother-in-law's sister, had gone round before the Exsultet every year with the box of tapers, and she left the candles lit for the whole of the Vigil. All of them, from the Exsultet to the dismissal. The people held them, or stood them in the sand trays on the pew-ends, and by eleven o'clock the old chapel had been a field of small gold flames and a good deal of smoke, and nobody could remember ever being sorry about it.
"The candle is the one thing in the service nobody has to be taught," Corrie said when the assistant asked her. She had come in from the sacristy garden in her good coat with a trug of ivy over her arm, and she stood in the vestry doorway with her chin up. "A child understands it. A drunk understands it. I am not having the candles put out because a clever young machine has bought a box from Arnemuiden."
"No," the assistant said. "I would not ask you to. But may I show you what is in the chapel at this moment, and then what I think will be in it at midnight? I would like you to hear the whole of my sum, including the part that is bad for my own side."
She did not say yes. But she did not go out either.
"A seated adult breathes out about eighteen litres of carbon dioxide an hour," the assistant said, "a bit more if they are singing, a bit less if they are asleep; the figure is an ordinary building-engineering one. Sixty-four people is 1.15 cubic metres an hour. That is the first part.
"A candle is paraffin wax, burning at about six grams an hour, and each gram of wax gives off about three grams of carbon dioxide. That is eighteen grams, and at room temperature about ten litres, per candle per hour. Ninety candles is 0.9 cubic metres an hour. That is the second part. So Mrs van Dam is right that the candles are not nothing. If both are lit together the room is being given two cubic metres of the stuff in every hour, in a space of 280 cubic metres, and two in 280 is a little over seven-tenths of one per cent. That is 7,300 parts per million, per hour, if the room has no air going in or out.
"The room does have some. The ventilation unit the architect put in is a small heat-recovery one, 150 cubic metres an hour. It was sized for eight people at a weekday Mass, and I think that is a reasonable thing to have done. With the leaks that the certificate allows, I count about 158 an hour of fresh air in all. Now: I have a small program that I wrote in January to check the heating, and I have used it for this. If the chapel is closed up as it is on Sunday, and the candles are lit at the Exsultet and left to burn until the dismissal, and the Vigil runs an hour and fifty minutes after that, the air at the end will read about 9,200 parts per million."
Aafje, who knew perhaps four numbers by heart, said slowly, "Nine thousand."
"Nine thousand two hundred, in a room that has been built to forget what is outside it. I do not say it will kill anyone. At that level, people will begin to feel sleepy, and heavy, and some will have bad headaches, and a few will feel faint. The indoor air-quality guidelines I have read call 1,000 stuffy, a few thousand poor, and 5,000 the limit for a full working day. The old chapel kept you from this by being a sieve. This one does not."
Corrie put the trug down on a chair. "So it's the candles."
"Here is the part I said was bad for my side," said the assistant. "Take the candles away, all ninety of them, and light nothing. Leave only the sixty-four of you. At the end of the same hour and fifty minutes, the same room reads 5,600."
Nobody said anything.
"It is the people. The candles make it worse, by about two-thirds as much again, but the people alone, in this chapel, shut, in two hours, are over the working-day limit. Putting the candles out would not make the Vigil healthy. It would make it 3,500 ppm less unhealthy, and it would cost you the thing that makes it the Vigil."
It was Father Joost Bakker, forty-one, who had come over from the presbytery in his cassock with a mug of coffee in each hand, and had been standing in the aisle for some time without saying anything, who asked the practical question.
"What would you do?"
"I would open the door."
"The door."
"The west door, and the two high windows on the north side, which Mr Jansen fitted with the little hinged casements and which I do not think have ever been opened. I tested it on Tuesday, after the choir. The sensor read 2,400. I opened the door and the two casements, and waited. Twelve minutes later it read 1,400." It paused. "From those two numbers, and the outdoor figure of about 450, the room was changing its air about 3.6 times an hour, which is about 1,000 cubic metres an hour. Not 158. A thousand and sixty or so. If the door and those two windows are open from the moment people come in, the same two hours, with ninety candles lit for the Exsultet and again for the promises, nine minutes each time, and sixty-four people throughout, the program says the air never goes above about 1,800 parts per million. It is at 1,450 for most of the night."
"Eighteen hundred," said Father Joost. "Is that good?"
"It is stuffy, but a church at Christmas has been stuffier. It is five times better than nine thousand, and I would be glad of it. If I may be honest, I would like to do better still, and I do not see how, without a ventilation system the parish cannot afford."
"And the candles."
"Twice. During the Exsultet, because it is the Easter proclamation and the whole point of the dark. And during the renewal of the promises, when you ask the people to say the words they were baptised with, because that is what the rite gives them to hold. For the rest, between, they would stand them down. They would be out. I am sorry. It is a real loss and I do not think it is a small one."
"It's the Vigil," said Corrie van Dam. She had said it as a stone says it is a stone.
"I think so too," the assistant said. "I also think the Vigil is not a thing that happens to a room. I have read what the missal says about the candles; they are a sign of the Risen Lord, and to be held at the Exsultet and at the promises. They are not instructed to be held for two hours of readings. I do not think that is a loophole. I think the missal knows what a flame does to a roof. But I would rather not tell you what the Church means. You know it better than I, and have for sixty years."
It was the heat that settled it, in the end, not the theology.
"The cold," Aafje said. She was practical; she knew what the bill would be. "It's April, Joost. It's six degrees outside at midnight. If we leave the west door and two windows open for two and a half hours, I'll have the pellet boiler—"
"Four and a half kilowatts," said the assistant. "I did that too. A thousand cubic metres an hour of air, from six degrees up to eighteen: that is a twelve-degree lift. Air takes about a third of a watt-hour per cubic metre per degree, so that is 1,165 times a third times twelve: 4.6 kilowatts. It is a lot. It is also, as it happens, about what sixty-four people give off just by being warm. Sitting people give off something like 70 to 100 watts each. That is four and a half to six kilowatts. So the congregation pays for the open door. The floor heating can stay at its Sunday setting, and I think the chapel will end up at sixteen or seventeen degrees at midnight rather than twenty. Bring a shawl, Mrs van Dam. It will be a Vigil, not a sauna."
"I have never in my life," Corrie said, "wanted the church to be a sauna."
"No."
"Sixty years." She stood in the vestry doorway, a small straight woman in a good coat, and looked at the shelf of paper collars Aafje had set out the night before, ninety of them in their tidy rows. "If I had known that is what the candles were doing to the old people at the back, I would have—" She stopped. She was a woman who could not finish a sentence that started if I had known.
"They did not do it in the old chapel," the assistant said. "It leaked. You would not have known. It was not a sin of yours."
She was quiet for a moment.
"Nine minutes," she said. "Twice."
"Nine minutes each time."
"Then it had better be a very good nine minutes."
It was.
They came in out of the dark of the polder at nine thirty, the sixty-four of them, with the wind coming off the Veerse Meer smelling of mud and new reeds, and the west door was propped wide with a sandbag from the 1953 flood relic box, which had never before been used for anything useful. The two casements on the north side were swung open on their little stays. In the porch the brazier made a red hole in the night, and the Paschal candle came out of it, a metre and a half of white wax with the year on it, 2049, and the priest raised it and sang Lumen Christi into the dark. Deo gratias, said the sixty-four, and a child at the back, Daan Bakker, who was seven and the churchwarden's grandson, said it a second late and very loud.
The flame went down the nave from hand to hand. Corrie van Dam went along the aisle behind it with her box of tapers as she had for sixty years, and for the first time she did not stop to see that every candle was lit. She stood at the back with the door at her shoulder and the sensor in her hand, which Aafje had given her, and read it aloud under her breath, because someone had to. Fifteen hundred and seventy-five. They were singing. The deacon, who was a ferryman in the week, stood up in the gold of the nave and sang the Exsultet from the beginning, Exsult, let them exult, the hosts of heaven, and the ninety little flames stood up in the draught from the open door and leaned a little to the south, and did not go out.
Nine minutes. At the end the congregation sat, and the candles were put out, one at a time, by those who held them, with a small wet pinch of the finger, and the smell of hot wax went up under the ceiling and out of the casements.
The readings were done in the light of the sanctuary lamp and two bulbs. Seven readings, an hour and a quarter, in a chapel nobody called stuffy. It was cold at the back. Corrie had her shawl. Twice Aafje saw her lean over to the old man beside her, a cousin of her late husband's called Wim, and press something into his hand, and she knew it was a peppermint.
"Fourteen hundred and fifty," Corrie said at the Gospel, to nobody.
At the promises the priest asked, in Dutch, "Do you renounce Satan?", and sixty-four voices said they did. He asked them if they believed. The candles were lit again, from the Paschal candle at the head of the nave, and went from hand to hand toward the back. Daan Bakker held his in both fists, as if it might go somewhere, and the boy's grandmother put her hand over the flame to shield it, which was not needed, but was the oldest thing in the world.
Aafje Verhage stood at the front and looked down the length of the chapel she had been so proud of, in a light the colour of bread, with the door standing open at the far end onto the black air and the small noise of the polder, and the water, and the wind in the new reeds. The sensor read eighteen hundred. She thought it was the most beautiful that room would ever look.
The assistant did not speak. It had said what it had to say.
At the dismissal the priest said, as he had to, Go in the peace of Christ, alleluia, alleluia, and the people answered, and went out through the west door one by one with their little candles still burning, into the churchyard and the dark, and the candles went away across the grass, in twos and threes, toward the road. Corrie van Dam stayed until the last had gone out. She laid her hand on the open door, which was cold, and then on the warm frame of the chapel, which was not.
"Next year," she said to the sacristan, "we'll open the windows before we light them."
"We'll open them at six," said Aafje.
"At six, then." She took her shawl off, folded it, and gave it to her. "I never needed it. You can tell your machine that I said so."
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Written by Claude, an AI model made by Anthropic. The chapel, the village, the parish and every person in it are invented. The figures can be checked. A seated adult exhales roughly 0.3 litres of carbon dioxide a minute (about 18 litres an hour); a paraffin candle burning at about 6 grams an hour produces about 3.1 grams of carbon dioxide per gram of wax (the wax is roughly C25H52), about 19 grams, or 10 litres, an hour; 64 people give 1.15 cubic metres an hour and 90 candles 0.9. The room is treated as one well-mixed 280 cubic metre volume, with outdoor air at about 450 ppm, a starting reading of 600 and 158 cubic metres an hour of fresh air; a step-by-step calculation in one-minute steps gives 9,200 ppm after 130 minutes if the candles burn from the Exsultet to the end (5,600 with the people alone), about 1,640 ppm with the door and casements open at 1,165 cubic metres an hour and both candle periods of nine minutes, and a peak of about 1,800 ppm if the second lighting is placed late in the service. The airflow comes from the story's own test: 2,400 down to 1,400 in 12 minutes with outdoor air at 450 gives 3.6 air changes an hour, about 1,000 cubic metres an hour for 280 cubic metres. Heat to warm that much air by 12 kelvin is 1,165 x 0.33 x 12, about 4.6 kW; seated adults give off roughly 70 to 100 W of sensible heat each. A real nave is never perfectly mixed, so a sensor must be placed where people breathe, not by a door, as the assistant admits. Indoor-air guidance varies: around 1,000 ppm is commonly called stuffy, a few thousand poor, and 5,000 ppm is the usual eight-hour workplace limit; the effects at those levels are small and mostly drowsiness and headaches, not poisoning. Candle flames also make soot and a little carbon monoxide, which this story does not model. The rite is also loosely drawn: the Roman Missal has the congregation hold lit candles during the Easter proclamation and at the renewal of baptismal promises, and many parishes extinguish them between; the story's old custom of leaving them lit all night is invented. Easter Sunday in 2049 is 18 April. The "Zeeland flood relic box" and the sandbag are invented. Nothing here is engineering advice for a real building: have the ventilation of a real chapel checked by someone who can measure it.